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【单选题】
设 , ,且X与Y相互独立,则D(2X-3Y)=( ).A.
2
B.
4
C.
12
D.
28
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举一反三
【单选题】. At the meeting I suggested that every class ___ divided into eight groups.
A.
be
B.
was
C.
were
D.
are
【简答题】产生尿液的器官是 _____ ,储存尿液的器官是 _____ 。
【简答题】冬虫夏草为[填空(1)] 科真菌[填空(2)] 寄生在[填空(3)] 科昆虫幼虫上的[填空(4)] 及[填空(5)] 的复合体。
【单选题】People have divided opinions about( ).
A.
the benefits a big company provides to graduates.
B.
the advantages a small company offers to graduates.
C.
whether graduates should work for a large or a small company.
D.
whether graduates can gain different experience.
【单选题】For years, people arc divided over .
A.
ways to curtail greenhouse gas emissions
B.
the issue whether the world is really warming up
C.
the effect of greenhouse gases
D.
the role of humans in global wa rm ing
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