(A为正确选项,B为错误选项)

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(A为正确选项,B为错误选项)
1.------What would you do if it ________ tomorrow?------We have to carry it on ,since we've got everything ready.
A.rains B.will rain
2.I don't really work here ; I ____ until the new secretary arrives.
A.am just helping out B.have just helped out
3.I've won a two-day holiday to Florida.I ______ my mum.
A.an taking B.have taken
4.The Olympic Games_____ every four years.
A.are held B.are holding
5.The house belongs to my aunt but she______ here any more.
A.doesn't live B.hasn't lived
6.Teenagers________ their health because they play computer games too much.
A.are damaging B.damaged
7.------- Have you got any job offers?
-------- No.I_______
A.am waiting B.had been waiting
8.Years ago we did't know this,but recent sience________ that people who don't sleep well get soon ill.
A.has shown B.showed

1. if条件状语从句中主句将来时,从句现在时
2. help out的动作在说话时并未完成,而是正在进行
3. 现在进行时也可以表示将来的概念,故这里用A 而B表示动作已经发生,事实并不是这样
4. 奥林匹克是hold的宾语,所以用被动词组：hold the olympic games
5. live是持续性动词,一般不和完成时一起使用,另：有any more一般用一般现在时或过去时
6. because后是一般现在时,句子前后语法保持一致,故选现在时
7. A单纯地表示“正在等待”的这个状态,而如果要用B的话,后面还要加上时间状语
8. 看到recent第一反应就是与现在完成时搭配,这也算是固定用法了而过去时显然与时态不符

(A为正确选项,B为错误选项) A、理数分为正有理数、零和负有理数，所以A选项错误；B、单项式和多项式统称为整式，所以B选项正确；C、 The shoes(A) make my feet(B) to feel(C) very hot(D).错误选项为；正确 45.They(A) need(B) some more(C) breads(D).错误选项为------;正确答案为- We see some(A) Chineses(B) near(C) our(D) school.错误选项为------ Let me(A) to close(B) the door(C) for you(D).错误选项为-----;正确答案 A选项、B选项哪里错误了求详细解释' 以下选项中正确的实型常量是（） A）0 B）3.1415 C）.871 为什 A、整数包括自然数和负整数，故本选项正确；B、应为数轴上的点与实数一一对应，故本选项错误；C、-|a| B选项错误原因选项B为什么错误? A、某工厂每天节约用电150度，150为近似数，所以A选项错误；B、杭州市人口达120万，120为近似数，所以