【題目】Ifyougoouttothefieldsat night in spring or summer, you can hear frogs singing【1】(joy) here and there. It seems as if they were performing a field symphony（交響樂）.

The frog is a good and useful creature that benefits human beings. They can catch fast-moving insects. Each frog eats a large number of pests that are 【2】harm) to crops. This little creature is regarded 【3】“the natural enemy of pests”.

【4】, frogs are getting fewer and fewer now. This is【5】they are killed and put on the table as a delicious dish by their chief enemy, human beings. It is a shameless and cruel act, isn’t it? Another reason responsible for the rapid reduction of frogs is 【6】farmers use insecticides (殺蟲劑) to kill pests and frogs get 【7】(kill)as a result of drinking poisoned water or eating poison-killed insects.

Something must be done without delay 【8】(save) frogs. If we don’t punish those 【9】sell and kill frogs to make money, then one day all of us 【10】(punish) by nature for failing to keep the balance of nature.

【答案】

【1】joyfully

【2】harmful

【3】as

【4】However

【5】because

【6】that

【7】killed

【8】to save

【9】who

【10】will be punished

【解析】試題分析：青蛙是益蟲，是人類的好朋友。它會幫助人類吃掉很多害蟲，但現(xiàn)在青蛙的數(shù)量越來越少。文章中分析了這一現(xiàn)象的原因。

【1】joyfully 考查副詞。在英語中通常使用副詞做狀語修飾動詞、形容詞或副詞。本句中使用副詞joyfully修飾動詞sing。

【2】harmful 考查形容詞。英語中系動詞通常和形容詞連用構(gòu)成系表結(jié)構(gòu)，所以本句中使用形容詞harmful和系動詞are構(gòu)成系表結(jié)構(gòu)。句意：每只青蛙都可以吃掉很多對莊稼有害的害蟲。

【3】as 考查固定短語。短語regard....as.....認為...是...；本句是其被動語態(tài)。句意：青蛙這種生物被認為是害蟲的天敵。

【4】But 考查上下文串聯(lián)。在第一段中作者敘述了青蛙對人類的巨大作用，但青蛙的數(shù)量在逐年變少。上下文之間存在轉(zhuǎn)折關(guān)系，所以使用表示轉(zhuǎn)折關(guān)系的連詞“but”聯(lián)系上下文。

【5】because 考查上下文串聯(lián)。前一句告訴我們青蛙的數(shù)量越來越少，本句解釋具體原因。所以使用連詞because引導(dǎo)表語從句，表示原因。

【6】that 考查名詞性從句。本句中that引導(dǎo)表語從句解釋青蛙變少的另外一個原因，意為主語是the reason，所以使用that而不能用because。

【7】killed 考查固定搭配。短語“get+過去分詞”可以表示被動也可以表示狀態(tài)。很多青蛙由于喝了有毒的水或吃了有毒的昆蟲而被殺死。

【8】to save 考查不定式用法。本句中不定式短語在句中充當(dāng)目的狀語。句意：我們要離開采取措施來挽救青蛙。

【9】who 考查定語從句。本題定語從句的先行詞是指人的代詞“those”，關(guān)系代詞who指代先行詞在句中做主語。

【10】will be punished 考查時態(tài)語態(tài)。if條件狀語從句中使用一般現(xiàn)在時代替將來時，主句使用將來時。且本句主語all of us與動詞punish構(gòu)成被動關(guān)系，所以使用一般將來時的被動語態(tài)。

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