Jack was too heavy and didn’t have a girlfriend. He felt very sad and went to a doctor for help. The doctor told him to eat less and exercise often.
One day, Jack was sitting by the road with his dog. Then a policeman came over. Jack stood up and began to run down the road. The policeman saw that and ran after him at once. After a few minutes the policeman caught Jack.
“Where are you going?” said the policeman. “Why did you begin to run when you saw me?” “Oh, no,” said the young man, “I am just doing exercise . Because I am too heavy, the doctor told me that I must run every day.”
“Oh, I see,” said the policeman. “sorry. You run to help yourself to keep healthy. That’s so good!” Then he ran after Jack to help him.
小题1:Jack wanted to .
A. be good at running B. makes friends with the policeman
C. help himself to lose weight(重量)
小题2:At first the policeman found the young man .
A. was sitting and playing near the river
B. was playing with his dog by the road
C. was sitting by the road with his dog
小题3:Who ran faster?
A. Jack. B. The policeman. C. The dog.
小题4:Which of the following is NOT TRUE?
A. The policeman thought Jack was a bad man.
B. The doctor told Jack to run after the policeman.
C. The policeman said sorry to Jack.
小题5:At last, the policeman ran after Jack because he .
A. wanted to help Jack to lose weight B. wanted to be a good policeman
C. wanted to keep healthy as well
和
分别为458.7491和0.7209，下列算式及对
=458.7491-0.7209X
，其中
为回归直线的起点值，在相关图上表现为X=0时，纵轴上的一个点，称为截矩；是回归直线的斜率，它表示自变量(X)每变动一个单位量时，因变量(Y)的平均变化量，并且取值有正负号，负值表示负相关，正值表示正相关。