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问题 单项选择题

统计学中所说的总体是指（）

A、任意想象的研究对象的全体

B、根据研究目的确定的研究对象的全体

C、根据地区划分的研究对象的全体

D、根据时间划分的研究对象的全体

E、根据人群划分的研究对象的全体

答案

参考答案：B

阅读理解
阅读理解。
Dear Wang Lin,
     I'm very happy that you are coming to England on a study tour next month. You are welcome to stay
with us-your host family!
     Clothes are always very informal (非正式的) here, so bring only T-shirts, sports clothes, sweaters or
anything you like, but don't forget to bring your raincoat-it rains quite often here.
     My family will make you a good breakfast and a hot dinner every day. On weekends we should cook
all meals for you. Let us know if you have any favorite meals.
     If you have to make a call from my family, I think you will have to pay for it. Also, please ask your
friends and family not to phone you late in the evening.
     If you don't feel well, please tell us. We can make an appointment for you. You can visit the doctor
before 10:30 or after 16:30.
     I hope you will have a good time here and, of course, learn lots of English!
                                                                                                                                            Cathy
阅读上面这封信，判断其正误。正确的写T，错误的写F。
( )1. Wang Lin is going to England to spend his holiday.
(     )2. From this letter, we learn that the weather in England is often wet.
( )3. Wang Lin can visit a doctor at any time in England.
(     )4. Wang Lin's host family will make all meals for him on weekends.
( )5. Making phone calls is free (免费的) in Wang Lin's host family.
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问答题 简答题

省煤器损坏后，会产生什么现象？
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