用叶中含梗测定仪和烟梗筛测定叶中含梗率，下列操作时间正确的有：（)。A.3分钟B.4分钟C.5分钟D.6

It can be inferred that______.

A．the Japanese government has contributed to the saving of the dying native tongue

B．the eight elderly people have to teach their native tongue to foreigners

C．Japanese people now are very interested in learning Ainu

D．the Japanese government has forced its young people to learn Ainu

请帮忙给出正确答案和分析，谢谢！

What does the woman give the man at last？

A．The man"s credit card.

B．The man"s signature.

C．The bill for the room.

D．The room key.

请帮忙给出正确答案和分析，谢谢！

What does the man say about himself？

A．He doesn"t have a studying brain.

B．He is afraid of examinations.

C．He doesn"t have a gift for English.

D．He hates to be a postgraduate.

请帮忙给出正确答案和分析，谢谢！

All of the following are the plans the woman mentioned EXCEPT______.

A．doing some volunteer work

B．doing some exercise

C．making some friends

D．enjoying the recreational activities

请帮忙给出正确答案和分析，谢谢！