48. For example, members of some groups make a kissing noise by tightening their mouths and sucking in air. Some groups use leaves to clean themselves or protect their hands from sharp objects. The scientists found that some of the animals use sticks as tools to remove insects from holes in trees. Other orangutans use leaves to crush insects or gather water.

　　49. Professors Parmesan and Yohe used similar methods to examine one hundred and seventy-two kinds of wildlife. They examined the timing of events in the spring, such as the appearance of flowers and the reproduction of animals. They found that these events happened an average of two days earlier than normal every ten years.

　　50. They say illegal operations to remove trees are causing large areas of forest to disappear. Environmental Investigation Agency director Dave Currey says the illegal operations are completely out of control.

　　资讯报道——与之相关的内容

　　46. E. 关键词：unusual weather; severe ocean storm。

　　47. C. 关键词：C-C-X; the biggest owner of electric power producers。

　　48. A. 关键词：orangutans; some of the animals use sticks as tools to…。

　　49. D. 关键词：birds, insects and plants; wildlife。

　　50. B. 关键词：controls tropical rainforests; causing large areas of forest to disappear。

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