单项选择题

Passage 3
Questions 33 to 35 are based on the passage you have just heard.

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.
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单项选择题
A．Plastic bags take hundreds of years to break down.B．Plastic bags are sighted in Arctic Ocean and close to Antarctica.C．Plastic bags have been washed up in Antarctica.D．Plastic bags are killing many sea turtles.
A．Plastic bags take hundreds of years to break down.
B．Plastic bags are sighted in Arctic Ocean and close to Antarctica.
C．Plastic bags have been washed up in Antarctica.
D．Plastic bags are killing many sea turtles.
单项选择题
A．100-meter race.B．200-meter race.C．Wrestling.D．Marathon.
A．100-meter race.
B．200-meter race.
C．Wrestling.
D．Marathon.
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