单项选择题

The passage mainly discusses______ .

A．a new way of highway speed control
B．a new pattern for painting highways
C．a new approach to training drivers
D．a new type of optical illusion
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单项选择题
What does the passage say about asteroids and meteoroids
A．They are heavenly bodies different in composition.
B．They are heavenly bodies similar in nature.
C．There are more asteroids than meteoroids.
D．steroids are more mysterious than meteoroids.
单项选择题
Which of the following best describes the anther’s tone in this passage
A．Optimistic.
B．Critical.
C．Objective.
D．Arbitrary.
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