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【单选题】
下列四种叙述中,正确的是 _______ 。A.
变应力只能由变载荷产生
B.
静载荷不能产生变应力
C.
变应力是由静载荷产生
D.
静载和变载都可能产生变应力
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举一反三
【单选题】______ took Liz two years to finish ______ other students took four years.
A.
It， what
B.
It, which
C.
This, that
D.
It, that
【简答题】A.Shift to something else. B.Write anything in his mind. C.Ask the professor for help. D.Stop for a little while.
【单选题】In order to help the students get a better understanding of the new conception,the professor____it with many examples.
A.
enchanted
B.
dissipated
C.
eliminated
D.
illustrated
【简答题】下列有关SD序列的说法，哪个是正确的?______。 A．SD序列对原核生物和真核生物的翻译都是重要的 B．SD序列相对于起始密码子AUG而言，是与方向和位置都无关的 C．SD序列有时也会隐藏在mRNA的茎一环结构中，对翻泽起到抑制作用 D．原核生物中的编码基因的翻译共同受到一个上游SD序列的控制
【单选题】---Have you ever read the book Homeless to Harvard. --- Liz Murray is really great. It __________ her only two years to finish what other students spent four years on . A. spent B. paid C. cost...
A.
spent
B.
paid
C.
cost
D.
took
【简答题】翻译以下句子 At the age of 15,Liz began high school,but she promised herself to become a straight A studeng . It noly took he two years to finish what other students took four years.
【单选题】下列有关SD序列的说法,哪个是正确的?
A.
SD序列对原核生物和真核生物的翻译都是重要的
B.
SD序列对于起始密码子AUG而言，是与方向和位子都无关的
C.
SD序列有时会隐藏在mRNA的茎-环结构中，对翻译起到抑制作用
D.
原核生物中的编码基因的翻译共同受到一个上游SD序列的控制
【判断题】It only took Liz two years to finish what other students took four years.
A.
正确
B.
错误
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