[单选题]已知||=1,||=6,(-)=2,则向量与向量的夹角是( )A.B.C.D.
[单选题]I can’t fully understand what his music conveys, his performance is quite impressive.A.AsB.SinceC.IfD.While
[单选题]She was so ________ that she wouldnt give in until she received a full apology.[ ]A. simpleB. luckyC. stubbornD. proper
[单选题]Its a big task. I dont think he_____can finish it before 6 pm.[ ]A. unique B. merelyC. only D. alone
[单选题]We all went to Jiuzhaigou during the summer holidays _____ Zhang Lin who was not herself at that time. [ ]A. in addition to B. besides C. includingD. apart from
[单选题]— Why does the boy keep crying— It is ______ he has lost his favorite car model.A.since B.so C.whenD.because
[单选题]We were about to go outing _____ it began to snow heavily.A. when B. while C. as D. until
[单选题]Seen from space, the earth looks like a blue ball, with __________ 75% of its surface covered with water. [ ]A. entirelyB. exactlyC. slightlyD. approximately
[单选题]Their cheerful voices showed that they were having a ?discussion.A.noisyB.friendlyC.seriousD.nervous
[单选题]_____ they decide which college to go to, students should research the admission procedures.A. As B. WhileC. UntilD. Once
[单选题]已知向量C、、满足c=1,Ia-BHA,(a-y)·(B-)=0.若对每一确定的B,的最大值和最小值分别为72、,则对任意B,72-12的最小值是()A.2B.1 C.2D.
[单选题]We made it possible ?the task would be finished ahead of time within three weeks.A.whatB.thatC.whichD.how
[单选题]To pay to see that movie seems foolish ________ you can see it on television for free.A.beforeB.thoughC.whenD.once
[单选题]When we talk about the cities in United States, the first ________comes into our mind is New York.?A.oneB.cityC.thatD.which
[单选题]已知向量a+b=(2,-8),a-b8.16,则与夹角的余弦值为( )A.6365B.6365C.6365D.13
[单选题]It is ______ for her to finish that maths problem in such a short time, because she is so clever.[ ]A. probableB. impossible C. likely D. possible
[单选题]He wants very much to go to college,but he is __________ about not passing the entrance examination.[ ]A.eagerB.anxiousC.patientD.worrying
[单选题]_____ maths is concerned, Tom is the best student in our class.[ ]A. As long asB. As soon asC. As forD. As far as
[单选题]It still puzzles todays scientists?_____ some mammals produce their young _____?others lay eggs to producetheir offspring (后代). [ ]A. that; while B. what; whileC. that; as D. what; as
[单选题]I think you should go back to your ______ plan, which is much more practical than the present one.( )A. random B. original C. abstract D. ridiculous
[单选题]Dont blame John. He is a child _____. [ ]A. at all B. in all C. after all D. above all