When people want to know about the weather, they usually go to there radios, TVs, newspapers, or to the Internet. However, you can also find many weather signs among wildlife, because of their highly developed senses. Drops in air pressure(壓力) produce an effect on small animals in many ways. Mice and deer are good weather indicators. People who spend a lot of time outdoors have observed that, before a storm, field mice come out of their holes and run around, Deer leave high ground and come down from the mountains.
Birds are especially good weather indicators because they also show the effect of a pressure drop in many ways. For example, some birds become irritable(急躁的)and quarrelsome and will fight over a piece of bread. Other birds chirp(嘰嘰喳喳)and sing just before a storm. It seems they know they won’t get another chance for an hour or two. Birds also seek safe places before a storm, You will sometimes see birds settling in trees or gathering together on a wire close to a building. Pre-storm low pressure makes the are so thin that birds have difficulty flying.
It is unusual to see many birds flying overhead in the summertime, rather than during the periods in the spring or autumn. Watch for other weather signs if you see this. If they fly in the wrong direction, they may be flying ahead of a storm.
By paying closer attention to some important signs in nature, we can become better prepared for any kind of weather.
【小題1】The word“indicators”in paragraph I probably means ________.
A.maps | B.services | C.signs | D.stations |
A.make more noise than usual | B.fly in different directions |
C.come down from tall trees | D.share a piece of bread |
A.By feeling a drop in air temperature. |
B.By noticing the change of wind directions. |
C.By feeling a drop in air pressure. |
D.By noticing the movements of other animals. |
A.Signs of a Storm | B.Drops in Air Pressure |
C.Animals’Sharp Senses | D.Nature’s Weather Signs |
【小題1】C
【小題2】A
【小題3】C
【小題4】D
解析試題分析:文章介紹的正是大自然里的天氣預(yù)報(bào)的征兆和各種跡象。
【小題1】C 推理題。根據(jù)第一段第四行Mice and deer are good weather indicators. 是指老鼠和鹿都很好的天氣預(yù)報(bào)的指示者。他們可以預(yù)報(bào)天氣,是天氣變化的跡象和征兆。故C正確。
【小題2】A 細(xì)節(jié)題。根據(jù)第二段第三行Other birds chirp(嘰嘰喳喳)and sing just before a storm.說明A正確。
【小題3】C 細(xì)節(jié)題。根據(jù)第二段1,2行Birds are especially good weather indicators because they also show the effect of a pressure drop in many ways.說明他們能感覺到空氣中氣壓的變化是主要的原因,故C正確。
【小題4】D 主旨大意題。文章介紹的正是大自然里的天氣預(yù)報(bào)的征兆和各種跡象,故D正確。
考點(diǎn):考查科普類短文閱讀
點(diǎn)評:本文介紹了大自然里的天氣預(yù)報(bào)的征兆和各種跡象,對于文章的細(xì)節(jié)理解要求較高。
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The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson.
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B. the new discovery could lead to search into ways to change skin colour safely
C. pop king Michael Jackson often changed his skin colour as he liked
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A. nowadays people who want to change their skin colour have to suffer a lot from the damage caused by the chemical treatment
B. Europeans and Africans have the same gene
C. the new discovery could help to find medical treatments for skin cancer
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But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vitamin D. So the related gene changes, according to Cheng.
Asians have the same version of the gene as Africans, so they probably acquired their light skin through the action of some other gene that affects skin colour, said Cheng.
The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson.
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A. find the different genes of humans’
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A. they are born light-skinned people
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Can people change their skin colour without suffering like pop king Michael Jackson? Perhaps yes. Scientists have found the gene that determines skin colour.
The gene comes in two versions, one of which is found in 99 per cent of Europeans. The other is found in 93 to 100 per cent of Africans, researchers at Pennsylvania State University report in the latest issue of Science.
Scientists have changed the colour of a dark-striped zebrafish to uniform gold by inserting a version of the pigment(色素) gene into a young fish. As with humans, zebrafish skin colour is determined by pigment cells, which contain melanosomes(黑色素). The number, size and darkness of melanosomes per pigment cell determines skin colour.
It appears that, like the golden zebrafish, light-skinned Europeans also have a mutation(變異) in the gene for melanosome production. This results in less pigmented skin.
However, Keith Cheng, leader of the research team, points out that the mutation is dif ferent in human and zebrafish genes.
Humans acquired dark skin in Africa about 1.5 million years ago to protect bodies from ultra-violet rays of the sun(太陽光紫外線), which can cause skin cancer.
But when modern humans leave Africa to live in northern latitudes, they need more sunlight on their skin to produce vit amin D. So the related gene changes, according to Cheng.
Asians have the same version of the gene as Africans, so they pr obably acquired their light skin through the action of some other gene that affects skin colour, said Cheng.
The new discovery could lead to medical treatments for skin cancer. It also could lead to research into ways to change skin colour without damaging it like chemical treatment did on Michael Jackson.
1.. The passage mainly tells us that ________.
A. people can not change their skin colour without any pain
B. the new discovery could lead to search into ways to change skin colour safely
C. pop king Michael Jackson often changed his skin colour as he liked
D. scientists have found out that people’s skin colour is determined by the gene
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A. find the different genes of humans’
B. prove the humans’ skin colour is determined by the pigment gene
C. find out the reason why the Africans’ skin colour is dark
D. find out the ways of changing peopl’s skin colour
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A. they are born light-skinned people
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C. they have fewer activities outside
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