2岁小儿，胸骨左缘第2肋间有连续性机器样杂音，肺动脉瓣区第2音亢进。心电图示左心房、

I like to swim _____________ the water. [ ]

A. in

B. on

C. with

.

Man’s shopping can be and often is completed in five minutes，which is less than a quanrter

________。

A．that of a woman

B．of that of a woman

C．of a woman’s

D．that of a woman’s

检验二氧化碳是否收集满的方法是[ ]

A．将燃着的木条放在集气瓶口

B．观察瓶口是否冒出气泡

C．用带火星的木条放入集气瓶中

D．集气瓶中倒入澄清石灰水

将一个函数声明为一个类的友元函数必须使用关键字 【8】 。