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  3. For millions of years, the changes in Earth’s climate have been driven by forces of nature. But for the last century and a half,

For millions of years, the changes in Earth’s climate have been driven by forces of nature. But for the last century and a half,

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问题      For millions of years, the changes in Earth’s climate have been driven by forces of nature. But for the last century and a half, Earth’s average temperature has been rising【C1】______ than any time in the past ten thou- sand years. The【C2】______ in science is that much of that change has been driven by us.The climate is not what it used to be. It’s not your grandfather’s climate anymore.
     The【C3】 ______ are everywhere: droughts in the American Southwest and Africa’s Sahara(撒哈拉),【C4】______ seas in Louisiana and Bangladesh (孟加拉国), tropical diseases spreading north and extremes of weather from Florida to France.
     There are people who still say global warming needn’t【C5】______ us. If it’s happening at all, it’s a natural trend, not much we can do about it. But there is now hard【C6】______ which shows that the warming is not only real. It’s【C7】______ . It’s altering the climate’s most basic elements like rainfall and evaporation, days of sunshine and nighttime temperatures. Those changes are【C8】______   the environments in the agricultural production,【C9】______ wild species with extinction and putting at risk our life styles, our health, and some of our favorite cities by the sea. We’ll follow the signs and see who i f anyone is responsible. We’ll meet scientists who are【C10】______ new climate evidence and we’ll see what we can do to help.
   A) worry            F) signs           K) faster
   B) rising           G) vast            L) consensus
   C) troubles         H) investigating   M) threatening
   D) quickly          I) dangers         N) damaging
   E) evidence         J) accelerating    O) concern
【C3】
选项
答案F
解析 从句法结构看，该题所填入的词应为复数名词作句子主语，选项中符合这一要求的单词有C)troubles， F)signs和I)dangers。从句意看，似乎三个选项都可以，但从语境看，下文提到了Well follow the signs and see w ho it any one is responsible．其中的signs提示该空填F)signs方能与上下文呼应。
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