B. all the animals on the earth have become smaller.

　　C. how climate change effects animals' size has not been found clearly.

　　D. climate change has more negative effects on warm-blooded animals.

　　4. What can we learn from the passage?

　　A. Bird have suffered more from climate change than fish．

　　B. Climate change have even affected plankton negatively．

　　C. Cold-blooded animals become smaller because of the lack of food.

　　D. The warming event has never happened in Earth' s history before.

　　参考答案1—4、DACB

　　阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出最佳选项。Seven years of careful design and planning all came together on Monday, when James Cameron became the first human to make a solo trip to the deepest known point on earth - the Challenger Deep! More importantly though, he appeared safely seven hours later, completing with exciting-photos and videos from this dark mysterious world that has been visited by only two humans before!

　　Seated inside a specially built 12-ton green submersible (潜水器) called the Deep Sea Challenger,  the brilliant filmmaker caught every moment of his 2-hour-36-minute journey down to the bottom of the Mariana Trench on video — given that it is 120 times larger than the Grand Canyon and a mile deeper than Mount Everest.       

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