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
From the third paragraph we know that ______.
A．an American team pointed a submillimeter telescope in Hawaii
B．the team used Hubble space Telescope and captured optical images of some galaxies
C．they found five faint old galaxies
D．there are several galaxies in the universe
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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