[单选题]已知向量a=(1,1),b=(2,n),若|a+b|=a·b,则n=A.-3B.-1C.1D.3
[单选题]______ is in the classroom. In fact many students were late for school ________me because of theheavy rain.[ ] A. No students; exceptB. Not every student; besidesC. Not all the students; but D. No every student; except
[单选题]A.+BC﹣= [ ]A.B.CDC.DED.DC
[单选题]In the play, the servant bursts in, next to the queen, ___________.A.empty-handedB.looks worriedC.looking puzzlingD.to his puzzlement
[单选题]If you go on doing so, you’ll _______ yourself sooner or later. A.damageB.destroyC.ruinD.break
[单选题]- How long did David work here - For half a year, he didnt leave much_______on us.A.expressionB.instructionC.conclusionD.impression
[单选题],为平面向量,已知=(4,3),2+=(3,18),则,夹角的余弦值等于( )A.865B.?865C.1665D.?1665
[单选题]Mrs Read went to the market and bought several ______ eggs.A. dozen of B. dozens C. dozen D. dozens of
[单选题]He had once been ?with drug dealings, but evidence found laterproved his innocence.A.accused B.sentenced C.chargedD.tried
[单选题]命题“任意x∈R,都有X>”的否定是( )A.存在x∈R,使得>B.不存在x∈R,使得>C.存在x∈R,使得<D.对任意x∈R,都有<
[单选题]The poor woman had not slept all night and was completely _________.A.burnt outB.reached outC.watched outD.turned out
[单选题]It is illegal for a public official to ask people for gifts or money ________ favors to them.A. in addition toB.in return forC.in revenge for D.in search of
[单选题]“函数f(x)为奇函数”是“f(0)=0”的[ ]A.充分非必要条件B.必要非充分条件C.充要条件D.即非充分又非必要条件
[单选题]The sooner we students ________ to the new school,the better it will be _______ our studies.A.adapt; forB.adjust; toC.adopt; forD.admit; to
[单选题]A. a leading scientist in maths,he once dived ________ itand contributed to his motherland.[ ]A. into B. to C. on D. at
[单选题]____ our teacher will allow ____ early after examination? A.Who do you think; leavingB.Do you think who; to leaveC.Do you think who; leavingD.Who do you think; to leave
[单选题]The dictionary isnt expensive but it is __________. [ ]A. great significanceB. for great significance C. of great significanceD. of great significant
[单选题]已知命题p:Vx∈R22<3;命题g:3x∈R,x3=1-x2,则下列命题中为真命题的是( )A.p AgB.p∧-qC.p∧qD.P∧-q
[单选题]在△ABC中,AB=,AC=2,若O为△ABC内部的一点,且满足=0,则=A.B.C.D.
[单选题]So far we have done a lot to build a low-carbon economy, but it is __________ ideal.?We have to work still harder. [ ]A. next toB. far fromC. out ofD. due to
[单选题]否定“自然数a,b,c中恰有一个偶数”时,正确的反设为( )A.a,b,c都是奇数B.a,b,c都是偶数C.a,b,c中至少有两个偶数D.a,b,c中至少有两个偶数或都是奇数