统计中所说的样本是指（）。 A.从总体中随意抽取一部分 B.有意识地选择总体中的典型
题型：单项选择题
问题：
统计中所说的样本是指（）。
A.从总体中随意抽取一部分
B.有意识地选择总体中的典型部分
C.依照研究者的要求选取有意义的一部分
D.从总体中随机抽取有代表性的一部分
E.从总体中随机抽取的一部分
题型：单项选择题
阅读理解
In a small village (村庄), there is a teacher, a nurse (护士), a driver (司机) and a worker. They are
good friends. What are their names? One is Mike, one is Jack, one is Tom and the other is John. Mike's,
Jack's and Tom's children are classmates. John doesn't have any children. He teaches his friends' children
at school. Mike has many hens. He gives the driver and the nurse eggs. Jack's child goes to the nurse's
house. The nurse's house is beside Jack's.
1. Are
the four people good friends?
A. Yes.
B. No.
C. Not.
D. They are brothers.
2. Are they all men?
A. Yes.
B. No.
C. Two are men. Two are women.
D. They are women.
3. What's John?
A. A nurse.
B. A driver.
C. A teacher.
D. A worker.
4. Who has hens?
A. Jack.
B. Tom.
C. Mike.
D. John.
5. Where is the nurse's house?
A. Behind Mike's.
B. Beside Jack's.
C. Beside Mike's.
D. Under Jack's.