問題詳情

Earth has warmed by about 1ºF over the past 100 years. But why? And _____1_____ ? Well, scientists are not exactly sure. The Earth could be getting warmer on its own, _____2_____ many of the world’s leading climate scientists think that things people do are helping to make the Earth warmer.Global warming refers to an average increase in the Earth’s temperature, _____3_____ in turn causes changes in climate. A _____4_____ Earth may lead to changes in rainfall patterns, a rise in sea level, and a wide range of impacts on plants, wildlife, and humans. When scientists talk about the issue of climate change, their _____5_____ is about global warming caused by human activities. It is because they are sure about the danger of the green houseeffect.

(A)quick
(B)now
(C)how
(D)where

參考答案

答案：C
難度：簡單0.796366
統計：A(73),B(188),C(1271),D(64),E(0)

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