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【单选题】
自然选择和人工选择都能形成新品种,它们共同的选择基础是A.
很强的繁殖能力
B.
遗传和变异普遍存在
C.
都在进行生存竞争
D.
都具有适应环境的能力
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【单选题】从均值为200,标准差为 50 的总体中抽取容量为 100 的简单随机样本,用样本均值估计总体均值。样本均值的数学期望是 ( ) 。
A.
100
B.
150
C.
200
D.
250
【简答题】A．Germans usually have a high respect for science. B．Einstein was forced to serve in the German army. C．Albert Einstein had no other interests besides science. D．Einstein's reputation was ruined becau...
【单选题】It can be learned from the passage that Germans no longer think that______.
A.
they will be misunderstood if they talk about the Wilhelm Gustloff tragedy
B.
the Wilhelm Gustloff tragedy is a reasonable price to pay for the nation' s past misdeeds
C.
Germany is responsible for the horrible crimes it committed in World War II
D.
it is wrong to equate their sufferings with those of other countries
【单选题】It can be learned from the passage that Germans no longer think that ________.
A.
the Wilhelm Gustloff tragedy is a reasonable price to pay for the nation’s past misdeeds
B.
Germany is responsible for the horrible crimes it committed in World War II
C.
they will be misunderstood if they talk about the Wilhelm Gustloff tragedy
D.
it-is wrong to equate their sufferings with those of other countries
【单选题】Germans usually think highly of ___.( )
A.
Truth and duty
B.
Authority and status
C.
The distinction between private and public
D.
All of the above
【单选题】The comparison of rates of Swiss and Germans walk to work is used to illustrate______.
A.
the wide differences even in neighboring countries
B.
the different analyses of people' s habits
C.
the high rates of inactivity in two countries
D.
the worrying about their differences
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