They studied what ______ since 2007 and found Australian electricity prices were among the  highest in the developed world.


  1. A.
    has happened
  2. B.
    happened
  3. C.
    had happened
  4. D.
    has been happening
C
解析：
考查時(shí)態(tài)。根據(jù)studied知道句子本身是過(guò)去時(shí)，2007年發(fā)生的事情正是研究的對(duì)象，說(shuō)明他們是在研究之前發(fā)生的，所以應(yīng)該使用過(guò)去完成時(shí)。
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)源：黃岡題庫(kù)練考新課堂　高一英語(yǔ) 題型：050

閱讀理解

　　A close friend of mine lives with six hundred wildlife on the Greek Island of Kyklos. Ever since he left school(where I first knew him), he has travelled all over the world collecting animals for his very own zoo. He hoped to collect at least two examples of every kind of animal on his island, like Noah before the Great Flood. But the flood that my friend was afraid of, was a flood not of water, but of people, I expect you have heard of my friend, he writes books about his travells, and about the wild and wonderful animals that he collects. The money from the books helps to pay for all the food that these animals eat.

　　My friend told me that when he was out looking for water last week, (there is not enough water on the island, though there is plenty all round it), he found oil. He needs money for his travells, and for his zoo, and a little oil would buy enough water for a life-time, but he knows that if he tells anybody else about it, it will be the end of his zoo and his life’s work.

　　So, he will not tell anybody (but you and me) about what he found, because oil and water do not mix.

1．The writer got to know his friend ________.

[　　]

A．on the island where his friend’s zoo is

B．a(chǎn)t the school where they studied

C．a(chǎn)t a certain place while his friend was travelling

D．a(chǎn)t the place where his friend found oil

2．My friend has travelled all over the world ________ for his zoo.

[　　]

A．to collect money
B．to collect plants
C．to write books
D．to collect animals

3．Last week my friend ________.

[　　]

A．found plenty of oil all round the island

B．was looking for water but found oil instead

C．found enough water on his island to last a life-time

D．went out looking for a job

4．In this text,“oil and water do not mix.”means ________.

[　　]

A．you can’t sell oil for water

B．oil and water can’t be mixed together

C．if you want to get the oil, you will lose all animals

D．my friend doesn’t need oil but water

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2011年安徽省六校教育研究會(huì)高二素質(zhì)測(cè)試英語(yǔ)卷 題型：閱讀理解

Boris Worm of Dalhousie University in Nova Scotia, Canada, led the international team that did the study. Professor Worm says species have recently been disappearing from oceans at increasing speed. At this rate, he says, all seafood species could collapse by 2048 and seafood supplies from the world’s ocean could be almost gone by then.
Other studies have also warned about the dangers of overfishing and the effects on ocean environments. But not everyone thinks the oceans are likely to be empty in fifty years. Some scientists said parts of the world do have problems, but others are doing a good job of protecting fish populations. Government officials in several countries with large fishing industries also questioned the research.
The study appeared earlier this month in Science magazine.
The researchers say damage to oceans affects not only fish populations but also the productivity of ecosystems. These complex systems help control water quality. The scientists say the loss of different kinds of sea life appeared to increase the risk of fish kills and beach closures from harmful algae growth.
The scientists examined the results of thirty-two experiments and observed forty-eight protected areas. They also looked at records of catches worldwide. They studied records from the United Nations Food and Agriculture Organization for nineteen fifty to two thousand three. And they examined archeological information and other historical records for twelve coastal areas. That research reached back over a thousand years.
Boris Worm says the findings were, in his words, "beyond anything we suspected." But he also said the situation is not too late to correct. He said that with good fisheries management, some species could completely recover in three to ten years.
【小題1】Which of the following isn’t the damage to the ocean?     

A．The species of fish in the ocean are reducing.
B．Sea water is polluted.
C．Sea water quality is improved.
D．Less productivity of ecosystem.
【小題2】The conclusion of the research led by Boris Worm is _________. 
A．unbearableB．unbelievable
C．doubtfulD．Convincing
【小題3】The research led by Boris Worm _________.          
A．was conducted by scientists from Canada
B．referred to information of many countries
C．lasted from 1950 to 2003
D．referred to records dating back to over 1,000 years ago.
【小題4】Which of the following statements is NOT true?      
A．It’s too late to take action to improve the situation.
B．Some species will recover with efforts.
C．Boris Worm hopes that people take the warning serious.
D．Boris Worm shows great concern about ecosystem.

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2012-2013學(xué)年陜西省榆林實(shí)驗(yàn)中學(xué)高二上學(xué)期期末考試英語(yǔ)試卷（帶解析） 題型：填空題

單詞拼寫 （共10小題；每小題1分，滿分10分）
【小題1】A _______(廣泛傳播的)flu epidemic affected eighteen western states.
【小題2】There has been serious _______(分歧) between the two political over the question.
【小題3】He couldn’t stand terrible English ________(氣候).
【小題4】The population had ________(減少) from about 8,300,000 in 1845 to less than 6,600,000in 1851.
【小題5】The _______(平均數(shù))of 3, 6and 9 is 6.
【小題6】The story ______(使興奮)the little boy very much.
【小題7】On hot days we often go _____(洗澡) in the river.
【小題8】I can’t _____(評(píng)價(jià)) his ability without seeing his work.
【小題9】I got into a _____(驚慌) when I found the door was locked.
【小題10】They studied the German market to find the _____(可能性) there for investment

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2015屆河北邢臺(tái)一中高一下期第三次月考英語(yǔ)卷（解析版） 題型：完型填空

Almost everyone wants to get smarter. We struggle to improve our  36_ , intelligence and attention. We drink cup after cup of coffee to help us  37_  the day.

 38 __, a new study published in Current Directions in Psychological Science warns that there are 39___ to how smart humans can get.

Each of our body parts develops in a certain way for a reason.  40  _, we are not 3 meters tall  41 _ most people’s hearts are not strong enough to send  42 _  up that high. Scientists say that our thinking ability works in the same way. A baby’s brain size is limited by a series of __43  , such as the size of the mother’s pelvis (骨盆). If our brains developed to be bigger, there could be more  44  during childbirth.

The study of Jews, who have an average IQ much _ 45_  than other Europeans, showed they were more  _46_  to develop diseases of the  _47_  system. This might be because of their increased brainpower.

If intelligence cannot be improved, can we at least get better at _ 48 _ ? Not really, say scientists. They studied  _49_  like caffeine (咖啡因)that improve attention. They found the drugs only helped people with serious  50 _ problems. For those who did not have trouble paying attention, the drugs could have the  51 _ effect. Scientists say that this suggests there is a(n)  52 limit to how much people can or should concentrate.

Our memory is also a “double-edged sword”. People with extremely good memories could  53__ having a difficult life because they cannot  _54 bad things that happen to them.

Thomas Hills, one of the authors of the paper, said that   55  all the problems in trying to get smarter, it’s unlikely that there will ever be a “super mind”.

1.                A．a(chǎn)bility          B．character       C．memory  D．emotion

 

2.                A．go through      B．put through      C．get through    D．carry through

 

3.                A．Though         B．Therefore       C．However  D．Meanwhile

 

4.                A．standards       B．measures       C．ranges   D．limits

 

5.                A．At first         B．In addition       C．For example   D．Above all

 

6.                A．until           B．because        C．before   D．so that

 

7.                A．blood          B．information      C．breath   D．strength

 

8.                A．factors         B．reasons         C．a(chǎn)spects   D．effects

 

9.                A．chances        B．deaths          C．choices   D．lives

 

10.               A．smarter        B．better          C．lower D．higher

 

11.               A．likely          B．possible        C．probable  D．sure

 

12.               A．physical        B．bodily          C．personal   D．nervous

 

13.               A．exercising      B．concentrating    C．memorizing D．thinking

 

14.               A．poisons        B．drinks          C．plants     D．drugs

 

15.               A．a(chǎn)ttention       B．family          C．health D．living

 

16.               A．same          B．opposite        C．different  D．similar

 

17.               A．lower          B．smaller         C．upper     D．higher

 

18.               A．end up         B．make up        C．start up   D．come up

 

19.               A．forget          B．remember      C．perform   D．share

 

20.               A．supposing       B．concerning      C．considering D．regarding

 

 

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：2012-2013學(xué)年四川省高二上學(xué)期期中考試英語(yǔ)試卷（解析版） 題型：閱讀理解

People who have lost the ability to understand or use words due to brain damage are called aphasics(失語(yǔ)癥患者). Such patients can be extremely good at something else. From the changing expressions on speakers’ faces and the tones of their voices, they can tell lies from truths.

Doctors studying the human brain have given a number of examples of this amazing power of aphasics. Some have even compared this power to that of a dog with an ability to find out the drugs hidden in the baggage.

Recently, scientists carried out tests to see if all that was said about aphasics was true. They studied a mixed group of people. Some were normal; others were aphasics. It was proved that the aphasics were far ahead of the normal people in recognizing false speeches — in most cases, the normal people were fooled by words, but the aphasics were not.

Some years ago, Dr. Oliver Sacks wrote in his book about his experiences with aphasics. He mentioned a particular case in a hospital. Some aphasics were watching the president giving a speech on TV. Since the president had been an actor earlier, making a good speech was no problem for him. He was trying to put his feelings into every word of his speech.

But his way of speaking had the opposite effect on the patients. They didn’t seem to believe him. Instead, they burst into laughter. The aphasics knew that the president did not mean a word of what he was saying. He was lying!

Many doctors see aphasics as people who are not completely normal because they lack the ability to understand words. However, according to Dr. Sacks, they are more gifted than normal people. Normal people may get carried away by words. Aphasics seem to understand human expressions better, though they cannot understand words.

1.What is so surprising about aphasics?

A．They can fool other people.

B．They can find out the hidden drugs.

C．They can tell whether people are lying.

D．They can understand language better.

2. How did the scientists study aphasics?

A．By asking them to watch TV together.

B．By comparing them with normal people.

C．By organizing them into acting groups.

D．By giving them chances to speak on TV.

3.What do we learn from this text?

A．People poor at one thing can be good at another.

B．What one says reflects how one feels.

C．Aphasics have richer feelings than others.

D．Normal people often tell lies in their speeches.

 

查看答案和解析>>

同步練習(xí)冊(cè)答案