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【多选题】
接待中必须及时道歉的情况是( )。A.
主人迎接客人因故迟到
B.
接待规格提高
C.
接待规格变化己经通知到主人
D.
接待规格临时变化
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【单选题】The figure shows a graph of the market for pizzas in a large town. If the price falls from $10 to $7 per pizza, the quantity of pizzas demanded will
A.
increase by 20.
B.
increase by 30.
C.
decrease by 30
D.
decrease by 10.
【单选题】The figure shows that the maximum amount a person is willing to pay for the 400th pretzel
A.
is greater than the marginal social cost of the 400th pretzel.
B.
is less than the marginal social benefit of the 400th pretzel.
C.
and the marginal social benefit of the 400th pretzel are both $2.
D.
is greater than the marginal social benefit of the 200th pretzel.
【单选题】The figure shows a position-versus-time graph of the motion of a car. Describe the velocity and acceleration during segments OA, AB, and BC. Which item is Not correct?【图片】
A.
In segment OA, the velocity is positive and constant.
B.
In segment OA, there is no acceleration.
C.
In segment AB, the velocity is increasing.
D.
In segment AB, there must be acceleration.
E.
In segment BC, the velocity is not constant.
F.
In segment BC, this velocity is greater in magnitude than the velocity in segment OA.
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