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【单选题】
一横波以速度 u 沿 x 轴负方向传播, t 时刻波形曲线如图( a )所示,则该时刻()
A.
A点相位为π
B.
B点静止不动
C.
C点相位为3π/2
D.
D点向上运动
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【单选题】We’ve known for a long time a high—fat diet,obesity and lack of exercise can increase the risk of developing heart disease and type 2 diabetes,two conditions affecting millions of Americans.What we ar...
A.
Different rates of common cancers in different regions result from different lifestyles.
B.
The rate of several extremely common cancers in the U.S.is higher by 1/1 0 or 1/20.
C.
People who migrate to the United States have high cancer rates after a generation.
D.
If people out of the western world stay at home,their risk of cancer won’t rise
【单选题】It's difficult for any of us to eat better, exercise more, and sleep enough, _____ we know we should. [     ]
A.
because
B.
even if
C.
as if
D.
unless
【单选题】— What can we do to prevent (避免) H1N1? — We should do more exercise and eat a ______ diet to stay ______. [     ]
A.
balanced; health
B.
balance; healthy
C.
balanced; healthy
D.
balancing; health
【单选题】It is difficult for us to eat better, exercise more and sleep enough, ____ we know we should. [     ]
A.
as if
B.
the moment
C.
even if
D.
so that
【多选题】下列关于数据说法正确的是( )
A.
数据是用来记录信息的可识别符号,是信息的具体表现形式
B.
数据是对现实世界的事物采用计算机能够识别、存储和处理的方式进行描述
C.
其具体表现形式可以是数字、文本、图像、音频、视频等。
D.
其仅仅是用于加减乘除等运算的。
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A.
balanced; us
B.
balance; ourself
C.
balanced; ourselves
D.
balancing; our
【单选题】下面关于电脑图形的说法中,正确的是:( )
A.
电脑图形是用数字或数学公式来描述的
B.
使用数字视觉技术生成的图形就称为电脑图形
C.
电脑图形由像素构成。每一个像素都用一定的数字来描述它的颜色
D.
以上都对
【单选题】听力原文: Nearly every day we are reminded to get more exercise, but this can be hard to do with the hectic lifestyles we have today. Multi-tasking—doing two or more things at the same time—is now a commo...
A.
Eating breakfast while driving to work
B.
Commuting while getting exercise
C.
Thinking while cycling
D.
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【单选题】This outdoor training is an exercise , as we know, teenagers' confidence can be built.
A.
which
B.
what
C.
that
D.
where
【单选题】We should take exercise now and then. I believe we will ___________ it a lot.
A.
benefit from
B.
benefit
C.
do good to
D.
be beneficial for
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