单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．They work at the zoo.
B．They are going to do some artwork.
C．They enjoy watching elephants.
D．They are going to feed the elephants.

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填空题

One theory thinks that increased temperature is disturbing the ______ of frogs.

填空题

The platypus frog became extinct by 1991.

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。