0  415214  415222  415228  415232  415238  415240  415244  415250  415252  415258  415264  415268  415270  415274  415280  415282  415288  415292  415294  415298  415300  415304  415306  415308  415309  415310  415312  415313  415314  415316  415318  415322  415324  415328  415330  415334  415340  415342  415348  415352  415354  415358  415364  415370  415372  415378  415382  415384  415390  415394  415400  415408  447090 

9.Pop music is liked by many people, but it is not _____ everyone’s taste.

  A.with          B.in           C.on          D.to

试题详情

8.We are kept ____ of what is happening in the world by reading newspapers and watching television.

  A.to inform       B.to be informen    C.informing      D.informed

试题详情

7.It was the first time that he______ a game, so he felt very sad.

A.loses          B.lost          C.has lost       D.had lost

试题详情

6.The girl got married ______ the man who she had been engaged _______.

A.with; with      B.to; to          C.with; to        D.to; in

试题详情

5.--- Didn’t you have a good time at the party?

  ---- Of course I did.As a matter of fact, I had such fun that time seemed to _____ so quickly.

  A.go by         B.go away       C.go out        D.go over

试题详情

4.When he came to,he found himself _____ by a group of villagers.

   A.surrounding                       B.being surrounded  

    C.surrounded                     D.surround

试题详情

3._____ you have bought!

    A.What a fine piece of furniture        B.How fine furniture

C.what a fine furniture             D.How beautiful a furniture

试题详情

2.His words surprised everyone.I couldn’t _____ so.

    A.imagine his saying                 B.think him saying

    C.imagine him to say                D.consider him saying

试题详情

第一节:单项填空(共35小题;每小题1分,满分35分)

从A、B、C、D四个选项中,选出可以填人空白处的最佳选项,并在答题卡上将该项涂黑。

1.---I don’t believe it’s good to hang the drawing here.

  ---- _______ I move it over there? Do you think it will look better?

    A.What about     B.What if        C.How about      D.What with

试题详情

15.在(2x-3y)10的展开式中,求:

(1)二项式系数的和;

(2)各项系数的和;

(3)奇数项的二项式系数和与偶数项的二项式系数和;

(4)奇数项系数和与偶数项系数和;

(5)x的奇次项系数和与x的偶次项系数和.

解:设(2x-3y)10a0x10+a1x9y+a2x8y2+…+a10y10(*)

各项系数和即为a0+a1+…+a10,奇数项系数和为a0+a2+…+a10,偶数项系数和为a1+a3+a5+…+a9x的奇次项系数和为a1+a3+a5+…+a9x的偶次项系数和a0+a2+a4+…+a10.

由于(*)是恒等式,故可用“赋值法”求出相关的系数和.

(1)二项式系数和为C+C+…+C=210

(2)令xy=1,各项系数和为(2-3)10=(-1)10=1.

(3)奇数项的二项式系数和为C+C+…+C=29.

偶数项的二项式系数和为C+C+…+C=29.

(4)设(2x-3y)10a0x10+a1x9y+a2x8y2+…+a10y10

xy=1,得到a0+a1+a2+…+a10=1①

x=1,y=-1(或x=-1,y=1)

a0a1+a2a3+…+a10=510

①+②得2(a0+a2+…+a10)=1+510

∴奇数项的系数和为;

①-②得2(a1+a3+…+a9)=1-510

∴偶数项的系数和为.

(5)x的奇次项系数和为a1+a3+a5+…+a9=;

x的偶次项系数和为a0+a2+a4+…+a10=.

试题详情


同步练习册答案