单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now listen to the passage.
According to the study, the spread of HIV can be slowed through ______.

A．reducing the amount of the virus in a person’s blood
B．improving people’s immune system
C．reducing other sexually transmitted diseases
D．new anti-viral drugs

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单项选择题

According to the man, what is the disadvantage of recycled waste paper

A．Its drab color.
B．A scarcity of it.
C．Its stale smell.
D．A problem in storing it.

单项选择题

What does the man say about the criticism of technology

A．Ignore the criticism.
B．We need to consider what technology may bring us.
C．He feels bad about the criticism.
D．He thinks the criticism is far-fetched.

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. According to the study, the spread of HIV can be slowed through ______. 您的浏览器不支持 audio 元素。

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now listen to the passage.
According to the study, the spread of HIV can be slowed through ______.