单项选择题

Question 22 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question.
Now, listen to the news.

A．high-tech genetic modification.
B．Thai researchers.
C．the help of some experts from China.
D．natural means.

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单项选择题

单项选择题

Question 22 is based on the following news. At the end of the news item, you will be given 5 seconds to answer the question. Now, listen to the news. 您的浏览器不支持 audio 元素。