呼吸急促似喘，喉间鸣响者谓之（） A.喘证 B.哮证 C.短气 D.少气 E.夺气

– People all over the world do something good for the earth on April 22nd –– Earth Day.

– Well. ______ what we should do is to make every day Earth Day.

A. And                      B. So                   C. But

在Excel97工作表中，有以下数值数据，在C3单元格的编辑区输入公式“=C2+$C$2”，单击“确认”按钮，C3单元格的内容为：

A．22

B．24

C．26

D．28

扩散的基本方式有哪两种？

_______ hard it is to plant so many trees around lake! [ ]

A. What

B. What a

C. How

D. How a

甲醛常用于下列何种材料中（）

A.木工板

B.防火板

C.人造石材

D.乳胶漆