One theory, ________ suggested by Harvard University, is that humans began cooking their food, thereby releasing nutrients locked in the raw food and reducing the time needed to chew it.
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which
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as
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that
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what
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Although he knew little about the large amount of work done in the field, he succeeded ________ other more well - informed experimenters failed.
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which
B
that
C
what
D
where
The hill ____ is covered with tress is called Huang Hill.
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of which top
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whose the top
C
whose top
D
top which
___________ is known to everybody, the noon travels around the earth once every month.
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It
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As
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That
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What
10. We went through a period _____ communications were very difficult in the rural areas.
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which
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whose
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in which
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We cannot figure out ________ quite a number of insects, birds, and animals are dying out.
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that
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as
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why
D
When