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Questions 5 to 7 are based on the conversation you have just heard.5.

A. The latest test on a rare animal species.
B. The finding of two new species of frog.
C. The second trip to a small remote island.
D. The discovery of a new species of snake.

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6.

A. He fell from a tall palm tree by accident.
B. A snake crawled onto his head in his sleep.
C. He discovered a rare fog on a deserted island.
D. A poisonous snake attacked him on his field trip.

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7.

A. From its origin.
B. From its length.
C. From its colour.
D. From its genes.

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4-3-人类肿瘤的85～90%是由环境因素引起的，其中哪种因素所占比例最大？

A. 生物因素
B. 化学因素
C. 物理因素

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4-3-会导致全球出现：冰川融化、气候异常、土地沙化、病虫害增加以及免疫力降低等问题的现象是？

A. 臭氧层破坏
B. 酸雨
C. 温室效应

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Questions 5 to 7 are based on the conversation you have just heard.5.

A. The latest test on a rare animal species. B. The finding of two new species of frog. C. The second trip to a small remote island. D. The discovery of a new species of snake.

6.

7.

4-3-人类肿瘤的85～90%是由环境因素引起的，其中哪种因素所占比例最大？

4-3-会导致全球出现：冰川融化、气候异常、土地沙化、病虫害增加以及免疫力降低等问题的现象是？

A. The latest test on a rare animal species.
B. The finding of two new species of frog.
C. The second trip to a small remote island.
D. The discovery of a new species of snake.