【題目】閱讀下面材料，在空白處填入適當(dāng)?shù)膬?nèi)容（1個(gè)單詞）或括號(hào)內(nèi)單詞的正確形式。

Polar bears live in such environment that is too cold for most animals. For much of the year, they live and hunt on the 【1】 ________ (freeze) Arctic sea ice. Nature has prepared them for the cold conditions but nothing has prepared them for the danger 【2】 ________ threatens(威脅) their only home.

The polar bears’ world is melting. Polar bears【3】 ________ (suffer) in a warmer world are in danger. Studies show that the polar ice 【4】 ________ (reduce) by 9.8% every 10 years since 1978.At present , about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their 【5】 ________ (survive). “The sea ice is more than just the platform that the bears walk 【6】 ________ ,” says Andrew Derocher, who studies North American polar bear populations. “Without 【7】 ________ , they can’t exist.”

Some melting and refreezing of the polar ice is natural. But in a 【8】 ________ (warm) world, these cycles speed up, and bears have less time to hunt. 【9】 ________ (normal), they have three months in the spring when they gain more weight and the extra fat is used later, 【10】 ________ the bears are not actively hunting. Therefore, it is urgent to protect the environment and maintain the ecological balance.

【答案】

【1】frozen

【2】that/which

【3】suffering

【4】has reduced

【5】survival

【6】on

【7】it

【8】warmer

【9】Normally

【10】when

【解析】

試題分析：通過本文考查學(xué)生的詞性在語(yǔ)境中的正確運(yùn)用能力。包括動(dòng)詞的時(shí)態(tài)，非謂語(yǔ)動(dòng)詞，副詞，代詞，連詞等。

【1】frozen 考查形容詞。這里用形容詞修飾名詞, frozen 冰凍的。

【2】that/which 考查定語(yǔ)從句關(guān)系詞。這里the danger是先行詞，在定語(yǔ)從句中作主語(yǔ)，所以用關(guān)系代詞that/which。

【3】suffering 考查非謂語(yǔ)動(dòng)詞。suffering in a warmer world是非謂語(yǔ)動(dòng)詞短語(yǔ)做后置定語(yǔ)修飾Polar bears，Polar bears是suffer的邏輯主語(yǔ)，所以用動(dòng)詞的-ing形式suffering。

【4】has reduced 考查謂語(yǔ)動(dòng)詞的時(shí)態(tài)。since 1978提示是現(xiàn)在完成時(shí)，the polar ice相當(dāng)于it和reduce自己是主謂關(guān)系，所以是has reduced。

【5】survival 考查名詞。用名詞作介詞賓語(yǔ)for their，所以用名詞形式survival。

【6】on 考查介詞。the platform 和不及物動(dòng)詞walk之間加on才能構(gòu)成介詞和賓語(yǔ)的關(guān)系。

【7】it 考查代詞。it指the polar ice，意思是：沒有極地冰，北極熊就不能存在。

【8】warmer 考查形容詞比較級(jí)。極地冰由于變暖而融化，冷了在結(jié)冰，但是比較暖和的世界里，這樣的循環(huán)就會(huì)加速。

【9】Normally考查副詞。這里用副詞修飾全句，句意：正常情況下，他們?cè)诖禾煊?個(gè)月，變胖增加脂肪以備后用。

【10】when 考查非限制性定語(yǔ)從句的關(guān)系詞。句意：脂肪在北極熊不能積極主動(dòng)去打獵的時(shí)候用。

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