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【单选题】
关于精子的叙述 哪项错误A.
由精子细胞形态变化形成
B.
精子一旦形成，便具有运动能力
C.
精子为蝌蚪状的细胞
D.
精子头是高度浓缩的细胞核
E.
核前2/3有顶体覆盖
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举一反三
【单选题】We estimate the running time of an algorithm by:
A.
Counting the number of lines in an algorithm
B.
Counting the number of equations in an algorithm
C.
Counting the number of key computational steps in an algorithm
D.
None of the options given
【单选题】From the first two paragraphs, we can estimate______.
A.
illegal immigration has a serious social problem in the U.S.
B.
the Pew Hispanic Center could not give the reason for the decline of illegal immigration
C.
the statistics of illegal immigration is not significant
D.
the political and social disorder in the U.S. is on the wane
【简答题】好读书, ;每有会意,便欣然忘食。(陶渊明《五柳先生传》)
【单选题】What does The World Bank estimate if we have a worldwide flu epidemic?
A.
Global wealth will go down by over three billion dollars and we'd have millions of deaths.
B.
Global wealth will go down by over three trillion dollars and we'd have millions of deaths.
C.
Global wealth will go down by over thirty billion dollars and we'd have billions of deaths.
D.
Global wealth will go down by over thirty trillion dollars and we'd have billions of deaths.
【单选题】We usually just estimate the running time of an algorithm because:
A.
The running time of a software program is too short to be accurately measured
B.
It is impossible to isolate the running time of a specific software program
C.
We generally do not want to implement different algorithms for the same computing problem in order to judge their respective performances
D.
None of the options given
【单选题】We _____ estimate the spirit of the Shanghai Expo too much, which is sure to play an important role in our daily life.
A.
may not
B.
should not
C.
must not
D.
cannot
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