(5分)某实验小组为了测定人体呼出的气体中CO2的体积分数，设计如下实验： （1

The Canadian friends from our school have given us a lot of books, few of______ a bit difficult for us Chinese students.

A．them are

B．that is

C．which are

D．which is

在PC中引起中断的中断源通常分为5种类型，分别是：I/O中断、( )、时钟中断、故障中断和程序中断。

A．硬中断

B．软中断

C．奇偶检验错中断

D．数据通道中断

Research studies show that there are some fundamental (1) between men and women in their attitudes to (2) matters. Women are far more likely to save for their children’s (3) and to save up to buy a (4) . Men tend to save for a (5) , and for their (6) . But in fact the need for women to save for their old age is far (7) than for men. Throughout the world, women are likely to live many years (8) than men. Furthermore it is the (9) women who will most often have to look after the children and thus they need more (10) to look after not just themselves but others. Women today need to look ahead, think ahead, not wait until they’re under (11) .
A number of (12) have been set up to help them do this. Some educational institutions offer night (13) in Money (14) . They can be given (15) on different ways of saving. It is usually advised that at least (16) of a person’s savings should be in low-risk investments but for the rest, (17) advisors often advise taking some (18) risks. Initiatives such as this can give women the economic (19) and knowledge they need for a comfortable, (20) retirement.

下列关于休克前期的描述正确的是

A．表情淡漠

B．面色苍白

C．皮肤紫绀

D．无尿

E．全身出血倾向