题目内容

They______at lunch time but the flight was delayed.

A. ought to have arrived
B. ought to arrive
C. must arrive
D. must have arrived

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烟草丛顶病毒病在田间由烟蚜传播，田间机械摩擦不传毒，人工汁液摩擦可传毒。

A. 正确
B. 错误

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下列哪种肽段易于形成α-螺旋？()

A. 多聚甘氨酸
B. 多聚脯氨酸
C. 多聚丙氨酸

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Peter; Look, I' m at the conference. There’s a supplier here I want to take out for dinner. ______The Old Castle？
Susan; Well, I remember the Bridge was bad, so don't go there. Oh, the Palace Garden, take him there. I' m not sure about the Castle.
Peter: OK, thanks.

A. What do you plan to do with the supplier？
B. Who did you go with on holiday？
C. Where was it you went last time？
D. Why don't you go to the Bridge？

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【C14】

A. through
B. into
C. by
D. with

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They______at lunch time but the flight was delayed.

A. ought to have arrived B. ought to arrive C. must arrive D. must have arrived

烟草丛顶病毒病在田间由烟蚜传播，田间机械摩擦不传毒，人工汁液摩擦可传毒。

下列哪种肽段易于形成α-螺旋？()

Peter; Look, I' m at the conference. There’s a supplier here I want to take out for dinner. ______The Old Castle？Susan; Well, I remember the Bridge was bad, so don't go there. Oh, the Palace Garden, take him there. I' m not sure about the Castle.Peter: OK, thanks.

【C14】

A. ought to have arrived
B. ought to arrive
C. must arrive
D. must have arrived

Peter; Look, I' m at the conference. There’s a supplier here I want to take out for dinner. ______The Old Castle？
Susan; Well, I remember the Bridge was bad, so don't go there. Oh, the Palace Garden, take him there. I' m not sure about the Castle.
Peter: OK, thanks.