D. human beings make mistakes easily

　　49. What’s the main idea of Paragraph 2?

　　A. Try to reach 50 points.

　　B. Never stop trying in your life.

　　C. Award yourself for your success

　　D. Don’t be afraid of missing your points.

　　50. The author proves his idea in Paragraph 3 through_________.

　　A. examples

　　B. numbers

　　C. experiments

　　D. stories

　　51. The underlined word “despondent” in the last paragraph means________.

　　A. frightened

　　B. disappointed

　　C. surprised

　　D. excited

　　D

　　This is the SCIENCE IN THE NEWS, I’m Barbara Klein.

　　Animal experts say one of the world’s most beautiful and rare kinds of big cat is close to disappearing from the wild. A study earlier this year found that about thirty Amur leopards(豹) still live free. The cats are also called Far Eastern leopards.

　　Recently, their numbers have been reduced by one. Some person shot a female Amur, then beat her to death. The animal’s body was discovered last month in the Barsovy National Wildlife Refuge in eastern Russia.

　　An official of the World Wildlife Fund, Darron, said this was the third such killing in the area in the past fives years. Mr. Collins said the death of even one adult female is a huge loss for the endangered cat. He noted that the killing reduces the possibility for cubs(幼兽) or young.

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