单项选择题

This kind of plants is getting, if no proper measures are taken it will disappear before long.

A．scarce
B．minimum
C．short
D．seldom
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单项选择题
Stephen William Hawking put forward a ______ that a self-contained universe may have no edge or boundary.
A．premise
B．foundation
C．pretext
D．presentation
单项选择题
Stephen William Hawkings new theory aroused quite hot ______ in the science world.
A．quarrel
B．suspicion
C．verdict
D．controversy
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