命题“若f（x）是奇函数，则f（-x）是奇函数”的否命题是（ ） A．若f（x）

Never lose much time _______ you should make use.

A．that

B．which

C．of which

D．of that

He said there was a great gap between the views expressed in the media and what ______ people were thinking.

A．usual

B．general

C．normal

D．ordinary

肺炎球菌的主要致病物质是

A．外毒素

B．内毒素

C．高分子多糖荚膜

D．溶血素

E．血浆凝固酶

我一生走南闯北，甚至出访欧美，然而想不到对自己少年时______的松花江，却______。

A．日思夜想 素昧平生

B．望穿秋水 望洋兴叹

C．大名鼎鼎 闻所未闻

D．魂牵梦萦 缘铿一面