单项选择题

The word "heyday" from the second paragraph can be best expressed by ______.

A．the best time
B．the worst time
C．the beginning
D．the ending
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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
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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