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问题 选择题

12. He gave us a nod and muttered a “yes” after _______ seemed like hours.

A．that

B．which

C．it

D．What

答案

 D

听力题

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Once there was a poor old woman. She lives by herself in a little house in a village. She didn，t have m  小题1: money but she was very kind.

One day a young man named Bill came to her d  小题2:  .He was very thin. He was very hungry and a 小题3: the old woman for help. The old woman said，“Come in and have dinner with me，but my dinner is only some potatoes.”They had d 小题4: together. After dinner，the old woman told Bill to t小题5: some potatoes with him. He thanked her and left.

Ten years later，Bill came b  小题6:to the old woman，s door again and gave her a bag of m  小题7:  .She was surprised. Bill said，“Ten years ago you gave me some p 小题8:.I grew some potato plants. From those plants，I grew some more plants. Now I，m a r  小题9: farmer. But I never forget how k  小题10:  you were to me.”
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单项选择题

根据色谱法定性规律，当采用（）色谱柱时，低沸点组分先出峰.

A、弱极性

B、中等级性

C、强极性

D、氢键型
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