单项选择题

Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.
The mining industry in the U.S. became safer after the late 1960s because

A．the U.S. Senate passed laws requiring federal mine inspections.
B．the U.S. Congress passed laws requiring federal mine inspections.
C．the U.S. health and safety officials passed laws requiring federal mine inspections.
D．the U.S, mine companies passed laws requiring federal mine inspections.

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单项选择题

How does the man feel about the development of tooth transplants

A．Suspicious and angry.
B．Surprised but hopeful.
C．Doubtful and worried.
D．Shocked but move

单项选择题

According to the passage, the island’s deafness rate has fallen in the twentieth century because

A．the patterns of marriage have changed.
B．many deaf people have regained their hearing.
C．most of the original population has left the island.
D．the island has become famous for its research facilities.

Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions. Now, listen to the news. The mining industry in the U.S. became safer after the late 1960s because 您的浏览器不支持 audio 元素。

Questions 21 to 23 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.
The mining industry in the U.S. became safer after the late 1960s because