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【单选题】
有时也将部分分级效率为 的粒径称为切割粒径。A.
75%
B.
50%
C.
30%
D.
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举一反三
【简答题】I doubt the (true) ______ of the Story but many people believe it.
【单选题】Many people believe that our species ______ threatened with extinction.
A.
is
B.
are
C.
are to be
D.
used to be
【单选题】今年5月18日．英美科学家公布了人类第一号染色体的基因测序图，这个染色体是人类“生命之书”中最长也是最后被破解的一章．据报道，第一号染色体中共有2.23亿个碱基对，2.23亿这个数用科学记数法可表示为（ ）
A.
2.23×10 5
B.
2.23×10 6
C.
2.23×10 7
D.
2.23×10 8
【单选题】Many people believe the author wrote the book in 1977. He died in 1975. ( but )
A.
Many people believe the author wrote the book in 1977 but he died in 1975.
B.
He died in 1975 , but many people believe the author wrote the book in 1977.
【简答题】2006年5月18日．英美科学家公布了人类第一号染色体的基因测序图，这个染色体是人类“生命之书”中最长也是最后被破解的一章．据报道，第一号染色体有2.23亿个碱基对，2.23亿这个数用科学记数法可表示为（ ）
【单选题】Many people believe that there will be few problems in our life in the future ______.can be solved by computers and Internet.
A.
that
B.
which
C.
as
D.
but
【简答题】According to scientists, many people believe that physical cleanliness is trongly linked to ______.
【单选题】Many people believe we are heading for an environmental disaster(灾难) _________ we radically(根本地) change the way we live.
A.
but
B.
though
C.
unless
D.
in case
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