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Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. What is suggested if you want to keep your friends

A．Write letters carefully.
B．Write letters promptly.
C．Write letters with a lot of information.
D．Write letters with a proper style.

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Who sent unmanned spacecrafts to the moon in the 1950s and 1960s

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. What is suggested if you want to keep your friends 您的浏览器不支持 audio 元素。