[单选题]直线与圆相交于M,N两点,若,则(O为坐标原点)等于A.-2B.-1 C.0 D.1
[单选题]I dont think Toms remarks are________;he is not supposed to say so.A.in placeB.in peace C.in surprise D.in trouble
[单选题]Every pupil has his own potential so it is not proper to _____them ____two kindsA.classify; intoB.put ;offC.lead ; intoD.betray ; from
[单选题]命题“若A=B,则sin A=sin B”的逆否命题是( )A.若sinA≠sinB,则4≠BB.若sin A=sin B,则A=BC.若A=B,则sinA≠sinBD.若4≠B,则sinA≠sinB
[单选题]Our classmates who prefer to hold a party for him are________the majority. [ ]A. at B. in C. on D. to
[单选题]_______, a learned man makes fewer mistakes in life than a man without knowledge. [ ]A. In generalB. As general C. On general D. At general
[单选题]It is unbelievable that Mr. Lucas leads a simple life __his great wealth.A.withoutB. despiteC. inD.to
[单选题]设平面向量a=(1,2),b=(-22y),若a∥b,则2a-b等于( )A.4B.5C.35D.45
[单选题]设s,t是非零实数,是单位向量,当两向量sI+/, ti-57的模相等时,的夹角是( ) A.—6B.—4C.3D.—2
[单选题]由下列命题构成的“p或q”,“p且q”形式的复合命题均为真命题的是( )A.p:,q:B.p:15是质数,q:8是12的约数C.p:4+4=9,q:7>4D.p:2是偶数,q:2不是质数
[单选题]In fact , the old couple looked forward every week ?___ their grandson . [ ]A. to see B. to seeing C. see D. seeing
[单选题]在边长为1的等边△ABC中,设,则a·b+b·c+c·a=A.B.0C.D.3
[单选题]The company has launched several types of cars this year, and one_______ appeals to the young.A.in returnB.in particularC.in additionD.in turn
[单选题]已知数列fa,那么“对任意的n∈N,点P,(n, a,)都在直线y=2x+1上”是“fa为等差数列”的( )A.必要而不充分条件B.既不充分也不必要条件C.充要条件 D.充分而不必要条件
[单选题]The shop assistant was dismissed as she was_______of cheating customers’.A.accusedB.chargedC.scolded D.cursed
[单选题]He had to take the medicine three times a day, so as to be _____ the pain in the leg. A.far fromB.away fromC.apart fromD.free from
[单选题]All of us are busy going over our lessons, as the Mid-term exam is _________.A.along the wayB.in the wayC.on the wayD.by the way
[单选题]The conference was held to discuss the effect that tourism has ________ the wildlife in the area.A.inB.onC.atD.with
[单选题]设a>0且a≠1,则“函数f(x)=a”在R上是增函数”是“函数g(x=x”“在(0+∞)上是增函数”的( )A.充分不必要条件B.必要不充分条件C.充要条件D.既不充分也不必要条件
[单选题]已知下列命题中:(1)若k∈R,且Ab=0,则k=0或b=0,(2)若a-b=0,则a=0或b=0(3)若不平行的两个非零向量a b,满足lab,则(a+b)-(a-b)=0(4)若与平行,则ab=albl其中真命题的个数是( )A.B.C.D.
[单选题]Modern equipment and no smoking are two of the things I like ______ working here. But whether to stay or leave is ___________.A.with; on youB.about; up to youC.at; up to youD.over; beyond you