10.Listening to the recording
A. They are found under the oceans.
B. They were most active when the Earth was first formed.
C. Their emissions created Earth’s atmosphere.
D. Their fumes are mostly steam.
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Questions 11 to 13 are based on the conversation you have just heard. Listening to the recording
A. Training astronauts to adapt to the extreme space.
B. Helping astronauts work in the extremes of space.
C. Designing the special clothes to protect astronauts.
D. Finding the suitable clothing material for astronauts.
12.Listening to the recording
A. It can cause severe burns.
B. It can freeze skin in a short time.
C. It can expand the gases in the body.
D. It can cause severe pains in the body.
13.Listening to the recording
A. He was a well-known American astronaut.
B. He designed devices to protect pilots.
C. He designed the first anti-pressure aircraft.
D. He became successful for his flying skills.
While both plans were perfectly sensible, only one seemed _____ in China’s particular situation.
A. useful
B. available
C. feasible
D. desirable
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