单项选择题

The title "Curtains Part on Ancient Star Nurseries" means ______.

A．scientists use curtains when doing research on star birth
B．star birth still remains a complete mystery to us
C．scientists are uncovering the mystery of star birth
D．scientists are producing artificial stars in star nurseries
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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
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
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