Many countries are now setting up national parks animals and plants can be protected.
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when
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which
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whose
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where
推荐题目
Wind power is an ancient source of energy we may return in the near future.
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on which
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by which
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to which
D
from which
The man__________has made up his mind to win will never say "impossible".
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whom
B
when
C
which
D
who
This is the biggest lab__________we have ever built in our university.
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which
B
what
C
that
D
Where
The young scientist has made such great achievements in his chosen field ______ nobody else can make.
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that
B
what
C
which
D
as