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【单选题】
Some children are in the park, and they are ________. [ ]A.
having a good time
B.
have a good time
C.
having good time
D.
have good time
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【多选题】(2分)在回归分析中,关于估计标准误差正确的是( )
A.
估计标准误差大，回归直线代表性小，因而回归直线实用价值也小
B.
估计标准误差大，回归直线代表性大，因而回归直线实用价值小
C.
估计标准误差大，回归直线代表性小，因而回归直线实用价值大
D.
估计标准误差可以看作排除x对y影响后，y随机波动大小的估计量
【单选题】Question 6
A.
Having his wife killed.
B.
Killing his wife in the U.K.
C.
Being involved in a taxi accident.
D.
Hiring a crew of hit men.
【单选题】Question 6
A.
Because she doesn't want to spend too much money.
B.
Because most of the places have already been taken.
C.
Because there aren't many places to choose from in that area.
D.
Because all the new students are looking for accommodation.
【单选题】Question 6
A.
There is a great variety of foods.
B.
There is a great variety of nutrients.
C.
It is difficult to make your choice of food.
D.
It is important to fit foods together properly.
【单选题】Question 6
A.
It can only drive in flat areas .
B.
It cannot go over 130 kilometers per hour .
C.
It has no gas pedals and steering wheels.
D.
It has no safety devices.
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