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A. . They are not allowed to speak.
B. . They must follow the rules.
C. . They treat them as sacred places.
D. . They are supposed to be quiet.

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A. . Talking loudly with others about what you are seeing.
B. . Speaking openly about what you are seeing.
C. . Breaking the rules of the art gallery and museum.
D. . Throwing out of someone who is talking aloud.

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Part IVDirections:In this section, you’ll hear some passages. At the end of each passage, you'll hear some questions. Both the passage and the questions will be spoken only once. After each question, choose the best answer from the four choices marked A, B, C, and D.Questions 15 to 17 are based on the passages you have just heard.[音频]

A. . To design the dependable military rockets.
B. . To have the business travel into space.
C. . To launch the one-man vehicle into space.
D. . To send unmanned vehicle into space.

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A. . It begins on April 9th, 1959.
B. . It is supported by the military.
C. . It is by no means an easy task.
D. . It experiences a series of failures.

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A. . The animal was sent into space by the Army and Air Force rocket.
B. . The animal escaped from the spacecraft before launching.
C. . The animal survived the launch and landed in the ocean.
D. . The animal was carried into flight over the Pacific Ocean.

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listen to the recording

A. . They are not allowed to speak. B. . They must follow the rules. C. . They treat them as sacred places. D. . They are supposed to be quiet.

listen to the recording

listen to the recording

listen to the recording

A. . They are not allowed to speak.
B. . They must follow the rules.
C. . They treat them as sacred places.
D. . They are supposed to be quiet.