单项选择题

A．tells
B．says
C．informs
D．expresses

A.tells
B.says
C.informs
D.expresses

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在图10．3．7所示TTL与非门构成的单稳态触发器中，若输入vI为宽度20μs的脉冲，试画出vO1、vI2、vO3、vO的波形，计算输出脉冲宽度。为使该电路能正常工作，对输入脉冲有何要求。

单项选择题

The Joy of Living Alone More and more Americans are living alone.Some live alone because of divorce or the death of a partner. __________ （46） Accordingto a recent U.S. census （人口普查）,25 percent of all householdsin the U.S. are made up of just one 'person.This is a dramatic change fromthe extended families of just a couple of generationS'ago.The typical person living alone is neitherold nor lonely. __________ （47） The majority of these people have chosen to livealone. They are responding to decreasing social pressure to get married and havea family.It's now socially acceptable, even fashionable,to live alone. As people get better jobs and become financially independent, itbecomes possible for them to maintain a one-person household. __________ （48） However,people who do get married are marrying at a later age and divorcing more often.The number one reason given by most peoplefor living alone is that they simply enjoy doing what they want when they want todo it. 'Living alone is a Iuxury,' says NinaHagiwara, 38. 'Once you do it, you can'tever go back to living with others.' David C'Debaca, 46, agrees. __________（49）Children think that being grown up means beingable to do exactly as they please.__________ （50） The chance to discover whetherthat freedom is as wonderful as it sounds is a chance more and more Americans aretaking. A．There's more pressure to get married nowadays.B．The growing number of women with good jobshas done much to increase the number of people living alone.C．However, even more people are living alonebecause they have chosen to.D．It seems that many grown-ups today are realizingthat childhood dream.E．In fact, a quarter of the 23 million singlepeople in the U.S. are under the age of 35.F．He says, '1 like being by myself.' 第 46 题请选择（46）处的最佳答案．

A.Some
B.S.
C.S.
D.This
E.
The
F.
It's
G.
The
H.'
I.__________
J.There's
K.
B．The
L.
C．However,
M.
D．It
N.
E．In
O.S.
P.
F．He
Q.'
R.

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