单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A．A class presentation.
B．Visiting a close fiend.
C．A television program.
D．Studying for a test.

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填空题

The 1918 pandemic killed 675,000 Americans at a time when the U.S. population was 100 million.

问答题

水污染的主要原因。2. 水污染的危害性。3. 水污染的总是的解决办法。 What Can We Do About the Water Pollution

Questions 19 to 22 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。