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
The attitude of the author is ______.
A．ironical
B．critical
C．appealing
D．militant
单项选择题
The main idea of this passage is ______.
A．traffic accidents are mainly caused by motorists
B．thousands of people are killed each year
C．the laws of some countries about driving are too lax
D．only stricter traffic laws can prevent accidents
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