单项选择题

Questions 20 to 22 are based on the passage you have just heard.

A.It can help solve global food crises.
B.It will become popular gradually.
C.It has attracted worldwide attention.
D.It will change the concept of food.

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问答题

Directions: For this part, you are allowed 30 minutes to write a short essay entitled Electronic Waste. You should write at least 150 words following the outlines given below in Chinese: 1．废弃的电子产品越来越多； 2．如何正确处理这些电子产品。 Electronic Waste

Questions 20 to 22 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。

Questions 20 to 22 are based on the passage you have just heard.