【单选题】【消耗次数:1】
15.Man _____ die without air or water.
will
have to
must
should
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相关题目
【单选题】 Man________die without air or water.
①  will
②  have to
③  must
④  should
【单选题】 Without air, there __________ no living things.
①  will be
②  would be
【单选题】 16.—What made more than 100 passengers die. --- ________the air crash in Russia.
①  Itwas
②  Therewas
③  Thatwas
④  Thiswas
【单选题】 Water_________ both by man and other living things.
①  was needed
②  is needed
③  needs
④  are needed
【单选题】 Something must have happened on their way. Or they_____ by now.
①  should have arrived
②  should arrive
③  would have arrived
④  would arrive
【单选题】 You are ____ to have had the help of such a man.
①  thoughtful
②  considerate
③  fortunate
④  moderate
【单选题】 You must have stayed up late last night, _____?
①  mustn’ t you
②  don’ t you
③  didn’ t you
④  needn’ t you
【单选题】 The door opens, and who should enter but the very man we were talking of.
①  A.门开了,谁想到进来的正是我们刚才谈论的人。
②  B.门开了,除了那个我们正在谈论的人,谁应该进来?
③  C.门开了,谁还能进来,不就是那个我们刚才还在谈论的人嘛。
④  D.门开了,果然是我们刚才谈论的人进来了。
【单选题】 -________ keep water running when you are brushing your teeth or washing your hands, Jack.  -OK. I know we must save every drop(滴) of water.
①  Please
②  Why not
③  Don’t
④  do
【单选题】 ______ the storm, we should have reached our company.
①  Because of
②  In spite of
③  In case of
④  But for
随机题目
【判断题】 设a,b是整数,若a|b,则[a,b]=|b|.
①  正确
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【判断题】 设a,b,c为正整数,c无平方因子,若 ,证明:a|b.
①  正确
②  错误
【判断题】 任意给出的五个整数中,不一定有三个数之和被3整除.
①  正确
②  错误
【判断题】 若3?a2+b2,则3?a且3?b.
①  正确
②  错误
【判断题】 素数的个数一定是无限的.
①  正确
②  错误
【判断题】 任何大于1的合数a必有一个不超过a的算术平方根的素约数.
①  正确
②  错误
【简答题】 [a, b][b, c][c, a]=[ab, bc, ca]x[填空].
【简答题】 1,-1,a,-a称为非零整数a的[填空]约数.
【简答题】 (a, b)[a, b] = [填空].
【简答题】 [填空] .