YAC载体具有什么样的功能性元件?为什么它在克隆大片段时具有很大的优越性?

（47）On the other, it links these concepts to everyday realities in a manner which is parallel to the links journalists forge on a daily basis as they cover and comment on the news.此处译文为：

The word “mania” （Line 4， Paragraph 2） most probably means

A． fun.

B．craze.

C．hysteria.

D．excitement.

Directions：Write a letter to your university library, making suggestions for improving its service.

You should write about 100 words on ANSWER SHEET 2.

Do not sign your own name at the end of the letter. Use “Li Ming” instead.

Do not write the address. （10 points）

请选择(2)处最佳答案（）。

A．confusedly

B．cheerfully

C．worriedly

D．hopefully