单项选择题

Work in parapsychology,______, has attracted a relatively small number of scientists.

A．is a very controversial field
B．which a very controversial field is
C．a very controversial field
D．a field very controversial which
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单项选择题
______ by the thought that she was having a heart attack, she screams for help.
A．Terrifying
B．Terrified
C．Being terrified
D．Having terrified
单项选择题
For centuries, until the first Americans reached the moon, men speculated as to______.
A．What looked like the satellite' s other side
B．what the satellite' s other side looks like
C．what did the satellite' s other side look like
D．what the satellite' s other side looks like
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