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
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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
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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