[单选题]已知=(2,-1),=(1,λ),若,则实数λ的取值范围是( )A.(2,+∞)B.C.D.(-∞,2)
[单选题]It may be 5 or 10 years __________ it is possible for people to find a space station on the moon.A.sinceB.beforeC.afterD.when
[单选题]--- Are your family ready for rafting---Yes, I really want my children to experience that ?they are young.?A.B.whileC.unlessD.if
[单选题]已知向量a=(1.1,272,若a⊥b,则等于( )A.B.2C.D.
[单选题]已知d,向量d与向量3的夹角是3,则x的值为( )A.±3B.±3C.±9D.3
[单选题]空间直角坐标系中,点(-2, 1, 9)关于x轴对称的点的坐标是A.(-2, 1, 9)B.(-2, -1, -9)C.(2, -1, 9)D.( 2, 1, -9)
[单选题]____ my teachers help, I wouldnt have made suchgreat progress.[ ]A. Thanks to B. Owing toC. But forD. As to
[单选题]Just like fingerprints, each persons DNA.is _________ unless he has a twin. ?[ ] A. unusualB. normal C. variousD. unique
[单选题]Peters jacket was the same as Jacks,but cost________. [ ]A. as much twice as hisB. twice as much asC. twice as muchD. as twice much as
[计算题]已知四点O(0,0),F(0,),M(0,1),N(0,2),点P(x,y)在抛物线x2=2y上.(Ⅰ)当x0=3时,延长PN交抛物线于另一点Q,求∠POQ的大小;(Ⅱ)当点P(x0,y0)(x0≠0)在抛物线x2=2y上运动时,ⅰ)以MP为直径作圆,求该圆截直线y=所得的弦长;ⅱ)过点P作x轴的垂线交x轴于点A,过点P作该抛物线的切线l交x轴于点B.问:是否总有∠FPB=∠BPA?如果有,请给予证明;如果没有,请举出反例.
[单选题]______ the report, more than 140 people lost their lives in the explosion accident. ( )A. Because of B. According toC. Due to D. As to
[单选题]—How many people attended the exhibition—I’m not sure. _____ speaking, a thousand or more.A.Strictly B.Steadily C.ExactlyD.Roughly
[单选题]As we all know, independence is very ________ for youngsters because sooner or later they will leave their families and live alone. A.essentialB.accurateC.flexibleD.temporary
[单选题]Many students find ________ jobs during their summer holidays to obtain some working experience.[ ]A. permanentB. comfortableC. temporaryD. stable
[单选题]____ , people in the north have noodles as their main food while thesoutherners are fond of rice in China.[ ]A. In commonB. In generalC. In total D. In return
[单选题]A.change has taken place in China.[ ]A.fundamentalB.essential C.elementaryD.basic
[单选题]He was a(n) ___________singer until the age of 40, when he turned professional.A.giftedB.amateurC.sacredD.entire
[单选题]Im quite ?to office work. Can you offer me some suggestions?A.familiarB.freshC.similarD.sensitive
[单选题]—We should adopt ________methods to deal with? some incidents. You know,anything could occur? in that situation.—I got it. Thank you for reminding me.A.flexibleB.typicalC.positiveD.concrete
[单选题]money is spent on tobacco every year. ( )A. A large amount of B. A large number of C. The amount of D. Large numbers of
[单选题]In the plane crash accident, the chance of the pilots’ survival is ______. A.slightB.slimC.smoothD.spare