单项选择题


SECTION A CONVFRSATIONS
In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions’ that follow.
Questions 1 to 4 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now listen to the conversation.
What does the professor say the scientists might learn about the planets by using the new telescope

A．Their surface features.
B．Their chemical composition.
C．Their temperature.
D．Their age.
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单项选择题
What can be inferred from the conversation about the man and his roommate
A．He is surprised at his discovery.
B．They have had these problems for a long time.
C．They are beginning to have problems.
D．They come from different countries.
单项选择题
How did the scientists establish the existence of the planets
A．They studied the gravitation in the appearance of the parent stars.
B．They were able to see the planets with a telescope.
C．They compared the parent stars to the Sun.
D．They sent astronauts on a mission into space.
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