单项选择题


Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now listen to the passage.
What are the Venus clouds composed of

A．Sulfur.
B．Acid.
C．Vapor.
D．Sulfuric acid.
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单项选择题
Some experts think the photo shows
A．the Polar Lander’s wreckage just left some spots.
B．the Polar Lander’s wreckage cannot find in the Mars now.
C．the Polar Lander has never landed on the Mars.
D．the Polar Lander’s wreckage is intact 6 years after the accident.
单项选择题
What docs the woman say about the mechanic
A．He only works on new cars.
B．He has fixed her car before.
C．He is one of her neighbors.
D．He will probably overcharge her.
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