单项选择题

Questions 1 to 3 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.Now, listen to the conversation.
Why is the trip to Mars a one-way trip（）

A．The return trip is too expensive.
B．There is no technology to get people back.
C．People don’t want to return.
D．The return trip is too risky.

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单项选择题

Which of the following is NOT mentioned in the passage（）

A．Obesity can damage one’s health.
B．Obesity is a growing problem all over the world.
C．Obesity is directly related to one’s habit.
D．Obesity has affected both boys and girls.

单项选择题

Why were some children offered only fruit and milk for lunch（）

A．The school stopped providing school lunch.
B．Their parents failed to pay for school lunch.
C．Some parents preferred fruit and milk for lunch.
D．These children chose to have something different.

Questions 1 to 3 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.Now, listen to the conversation. Why is the trip to Mars a one-way trip（）

Questions 1 to 3 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.Now, listen to the conversation.
Why is the trip to Mars a one-way trip（）