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 protects the sea dragon from a meat eater’s attack

A．Its enormous size.
B．Its plant-like appearance.
C．Its instantaneous response.
D．Its offensive smell.
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单项选择题
What effect will the increased use of DME instead of diesel fuel probably have
A．It will reduce the amount of pollutants in the air.
B．It will increase the amount of unpleasant odors from vehicles.
C．It will eventually destroy the ozone layer.
D．It will reduce the cost of running large vehicles.
单项选择题
What does the news item mainly report about U.S.
A．A competition is held to draw talented students to aerospace career.
B．It has the leading position in the space field.
C．A global rocket launch program is held by engineering students.
D．It is losing its competitive edge in the aerospace industry.
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