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问题 单项选择题

系统响应时间和作业吞吐量是衡量计算机系统性能的重要指标。对于一个持续处理业务的系统而言， （3） ，表明其性能越好。

A．响应时间越短，作业吞吐量越小

B．响应时间越短，作业吞吐量越大

C．响应时间越长，作业吞吐量越大

D．响应时间不会影响作业吞吐量

答案

参考答案：C

阅读理解
True or False. (判断下列句子是否符合短文内容，符合的用“T”表示，不符合的用“F”表示。)

Forest Smith is a member of Green First,
an environmental group.
       Our future on Earth looks very bad. We are
dumping waste on our land. We can't breathe
the air. The sea is polluted too.
       I visited some relatives recently in a small
village. They grow their own food and cycle
everywhere. They are not wealthy, but they are
happy and healthy.
       We must close the factories producing
useless products. That would reduce rubbish and
air pollution. We must recycle more, give up all
cars, and improve public transport.
A big problem is overpopulation in big cities. We
must give up big cities and factories, and get back
to a simple way of life.

John Green is a scientist at a university.
       Things are not as bad as Forest says. We'll
have a bright future. We don't need to give
up cars but we need to invent better, cleaner
engines. 
       This won't stop the problem of traffic
jams. So we need better public transport. We
should also recycle more.
        But some things are getting better. My
sister returned last month after living abroad for
five years. She said, "Our old neighbourhood
doesn't look the same as before-it is cleaner and
greener now."
        Science has brought many improvements.
A hundred years ago, most people died in their 40s.
We can't go back to a life like that.
( )1. Three experts were asked to give their views on the pollution problems this week.
( )2. The word "views" here probably means people's ideas or opinions.
( )3. Both Forest Smith and John Green think they'll have a bright future on the pollution problems.
( )4. Forest Smith's view on cars and public transport is the same as John Green's.
( )5. Forest Smith visited some relatives and found they lived a rich, happy and healthy life.
( )6. John Green's sister said their old neighbourhood looked cleaner and greener than before.
( )7. The passage mainly tells us something about different kinds of pollution on the earth.
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问答题 简答题

母畜的发情鉴定有几种？分别适用于哪些家畜？
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