单项选择题

Passage 2
Questions 30 to 32 are based on the passage you have just heard.

A．Place a tax on plastic bags.
B．Start using paper bags.
C．Start using reusable bags.
D．Use biodegradable bags.
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单项选择题
A．How to make a powerful rocket engine.B．How to ensure the safety of the crew.C．How to choose qualified crewmen for the trip.D．How to enable the spacecraft break free of gravity.
A．How to make a powerful rocket engine.
B．How to ensure the safety of the crew.
C．How to choose qualified crewmen for the trip.
D．How to enable the spacecraft break free of gravity.
填空题
D
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