单项选择题

In Line 2 of the second paragraph "it" refers to ______.

A．interstellar dust
B．star birth
C．the infrared
D．the light of hot young stars
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单项选择题
We can infer that the word ambiguous in the last paragraph probably means ______.
A．clear
B．uncertain
C．mysterious
D．satisfying
单项选择题
What does the author think of society toward motorists
A．Society smiles on the motorists.
B．Huge car parks are built in the cities and towns.
C．Victims of accidents are nothing.
D．Society condones their rude driving.
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