[单选题]已知、是非零向量且足(-2)⊥,(-2)⊥,则与的夹角是A.B.C.D.
[单选题]I recognized him _______ I saw him, though we had been apart for over a decade.A.as soonB.at onceC.the instantD.the first time
[单选题]The instructor asked us to list anything in our past that we felt __________ of, regretted and read our lists aloud. [ ]A. ashamedB. afraidC. sureD. proud
[单选题]When the shy girl couldnt answer the teachers questions, she felt _____ and uncomfortable.[ ]A. toughB. awkwardC. scepticalD. curious
[计算题]在边长为1的菱形ABCD中,∠A=60°,E是线段CD上一点,满足CEl= 2DE,如图.设AB=a,AD=b.(1)用、表示BE;(2)在线段BC上是否存在一点F满足AF⊥BE?若存在,判定F点的位置,并求LAFI;若不存在,请说明理由EDCB
[单选题]已知函数f(x)=。sin丌x+cos丌x,x∈R,如图,函数f(x)在[﹣1,1]上的图象与x轴的交点从左到右分别为M,N,图象的最高点为P,则PIn与PN的夹角的余弦值是[ ]A.B.C.D.
[单选题]More money will be to enjoy more convenience. [ ]A. bound B. beneficialC. dueD. determined
[单选题]_______________, the players began the game.A.Having take our seatsB.Taking our seatsC.Being taken the seatsD.After we had taken our seats
[单选题]Tom is an honest man; I say it,_________ I have been against him.A.even thoughB.as long asC.as ifD.and yet
[单选题]— How was your trip to New York, Jane— ?It was great ______ I lost my wallet.[ ]A. thatB. when C. becauseD. until
[单选题]“Don’t tell the news to him.” She said. →She advised me ________.A.not tell the news to himB.to not tell him the news to himC.not to tell the news to himD.not telling the news to him
[单选题]As is known to all language learners, newly learnt words will soon be forgotten unless ______ used in everyday communication.A.exactlyB.finallyC.graduallyD.frequently
[单选题]________, I’ll have a piece of chocolate, but it’s quite rare.[ ]A. FrequentlyB. NearlyC. UrgentlyD. Occasionally
[单选题]The form cannot be signed by anyone _____?yourself. ( )A. rather than B. other thanC. more than D. better than
[单选题]已知向量a=(110),b=(-10.2),且katb与2a-b互相垂直,则的值是( )A.1B.C.3-5D.7-5
[单选题]如图, △ABC中,AD、BE、CF分别是BC、CA、AB上的中线, 它们交于点G,则下列各等式中不正确的是 ( )BDA.BG=-BE3B.DG=-AG;C.1-3DA+-FC=-BC2D.CG=-2FG
[单选题]Although China has developed its economy greatly, its per capital GDP is still one-tenth of the United States.A.slightlyB.separatelyC.originallyD.roughly
[单选题]He has a ________ sense of direction and never gets lost in a strange place.[ ]A. sharpB. steepC. narrowD. pure
[单选题]It is said that both of the thieves _____ ten years _____.[ ]A. sentenced; in the prison B. were sentenced to; in the prisonC. sentenced; in prison D. were sentenced to; in prison
[单选题]_____ time goes on, people _____ better housing and jobs.A. When; wantB. While; need C. As; demand D. Since; ask
[单选题]Time was passing and we were getting ?because we would have to spend the night in the cave if no one came to the rescue.A.awkwardB.blankC.desperateD.breathless