要得到一个奇函数,只需将函数f(x)=sinx-3cosx的图象( ) A.向右平

题型:选择题

问题:

要得到一个奇函数,只需将函数f(x)=sinx-
3
cosx
的图象(  )
A.向右平移
π
6
个单位
B.向右平移
π
3
个单位
C.向左平移
π
6
个单位
D.向左平移
π
3
个单位
考点:已知三角函数值求角函数y=Asin(wx+φ)的图象与性质
题型:选择题
下列关于声音的说法中正确的是(  )

A.即使物体在振动,我们也不一定能听到声音

B.我们能区别不同的人说话的声音,只是因为他们的音调不同

C.声音在空气中的传播速度大于在其他常见物质中的传播速度

D.乐器发出的声音一定不是噪声

题型:选择题

We waited for the report of exam with  _____  anxiety. [ ]

A. a great deal of      

B. a great number of  

C. a great many     

D. a plenty of

题型:选择题

甲外出时在自己的住宅内安放了防卫装置。某日晚,乙橇门侵入甲的住宅后,被防卫装置击为轻伤。甲的行为是什么性质

A.故意伤害罪

B.正当防卫

C.防卫不适时

D.民事侵权行为,不构成犯罪

题型:选择题

“Have a nice day!” may be a pleasant gesture or a meaningless. When my friend Maxie says “Have a nice day” with a smile, I know she sincerely cares about what happens to me. I feel loved and secure since another person cares about me and wishes me well.

“Have a nice day. Next!”This version of the expression is spoken by a salesgirl at the supermarket who is rushing me and my groceries out the door. The words come out in the same tone(腔调)with a fixed procedure. They are spoken at me, not to me. Obviously, the concern for my day and everyone else’s is the management’s attempt to increase business.

The expression is one of those behaviors that help people get along with each other. Sometimes it indicates the end of a meeting. As soon as you hear it, you know the meeting is at an end. Sometimes the expression saves us when we don’t know what to say “oh, you may have a tooth out? I’m terribly sorry, but have a nice day.”

The expression can be pleasant. If a stranger says “Have a nice day” to you, you may find it heart-warming because someone you don’t know has tried to be nice to you.

Although the use of the expression is an insincere, meaningless social custom at times, there is nothing wrong with the sentence except that it is a little uninteresting. The salesgirl, the waitress, the teacher, and all the countless others who speak it without thinking may not really care about my day. But in a strange and comfortable way, it’s nice to know they care enough to pretend they care when they really don’t care all that much. While the expression may not often be sincere, it is always spoken. The point is that people say it all the time when they like.

小题1:How does the author understand Maxie’s words?

A.Maxie shows her anxiety to the author.

B.Maxie really wishes the author a good day.

C.Maxie encourages the author to stay happy.

D.Maxie really worries about the author’s security.小题2:What does the underlined sentence in Paragraph 2 mean?

A.The salesgirl is rude.

B.The salesgirl is bored.

C.The salesgirl cares about me

D.The salesgirl says the words as a routine.小题3: By saying “Have a nice day,” a stranger may _____.

A.try to be polite to you

B.express respect to you

C.give his blessing to you

D.share his pleasure with you小题4:According to the last paragraph, people say “Have a nice day”_______.

A.sincerely

B.as thanks

C.as a habit

D.encouragingly小题5:What is the best title of the passage?

A.Have a Nice Day—a Social Custom.

B.Have a Nice Day—a Pleasant Gesture.

C.Have a Nice Day—a Heart-warming Greeting.

D.Have a Nice Day—a Polite Ending of a Conversation.

题型:选择题

(6分)有a、b两个等体积且极易导热的密闭容器,a保持容积不变,b中的活塞可上下移动,以保持内外压强相等。在相同条件下将3mol A,1mol B分别同时混合于a、b两容器中,发生反应:3A(g)+B(g)2C(g)+D(g)

(1)达到平衡时,a中A的浓度为M mol/L。A的转化率为N,b中A的浓度为m mol/L,A的转化率为n,则M____m;N_____n(填>、<、=、无法比较)

(2)保持温度不变,按下列配比分别充入a、b两容器,达平衡后,a中A的浓度为M mol·L1的是      

A  6mol A+2mol B    B  3mol A+2mol C    C  2mol C+1mol B+1mol D

D  2mol C+1mol D    E  1.5mol C+0.5mol B+1mol C+0.5mol D

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