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【单选题】
根据自然选择学说，下列叙述中正确的是（ ）A.
变异定向，选择不定向
B.
变异不定向，选择也不定向
C.
选择是变异的原因
D.
变异为进化提供了原始的选择材料
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反馈参考答案：
举一反三
【简答题】The thieves were ____ by the police as
they were entering the bank.
【单选题】They could see three fine streams of hot water spouting from holes in the jacket of the radiator.
A.
They could see three thin flows of hot water coming out of holes in the outer cover of the radiator.
B.
They could see three beautiful flows of water gushing out of holes in the outer wear of the radiator.
C.
The could see three beautiful jets of water pouring from the holes in the outer cover of the radiator.
【多选题】新古典综合派主要由 ( ) 理论综合而成。
A.
1890 年马歇尔《经济学原理》
B.
1933 年张伯伦和罗宾逊不完全竞争理论
C.
1939 年希克斯的价值论和般均衡理论
D.
1936 年凯恩斯《就业、 利息和货币通论》
【简答题】已知a为实数，化简： -a ，阅读下面李华的解答过程，请判断是否正确？若不正确，请写出正确的解答过程： 李华的解答过程： -a =a -a · =（a-1） 。
【单选题】To their surprise, the thieves were ( ) by the police while they were entering the bank.
A.
spotted
B.
beat
C.
detailed
D.
released
【单选题】下面说法正确的是
A.
所有公文的标题，发文机关、事由、文种缺一不可
B.
拟写标题时，为了简练可以不标文种
C.
所有公文的标题，都可以省略发文机关及事由
D.
公文标题一般不用标点符号
【简答题】To their disappointment, the thieves were ____ by the police at the moment they were entering the bank.
【简答题】阅读下面一题及解答过程，请判断是否正确？若不正确，请指出错在哪一步？并写出正确的解答过程． 化简： a+ ab ab +b + ab -b a- ab a+ ab ab +b + ab -b a- ab = ( a ) 2 + ab ab + ( b ) 2 + ab - ( b ) 2 ( a ) 2 - ab a ( a - b ) b ( a - b ) + b ( a - b ) a ( ...
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