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莫高窟地处河西走廊西端，至今尚存（）洞窟：
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【单选题】(While) schools developing online curricula try to strike (a balance) between profits and prestige, many educators (are confusing) about their role in this (digital world).
A.
While
B.
a balance
C.
are confusing
D.
digital world
【简答题】某企业的总成本曲线如下图所示，A点为总成本曲线与纵坐标的交点，B点为过原点的直线与总成本曲线的切点。则下列说法中错误的是( )。 A．A点的纵坐标代表固定成本的大小 B．B点所对应的产量具有最低的平均成本 C．B点所对应的产量具有最低的边际成本 D．平均变动成本最低的产量低于B点的产量
【多选题】When your friend is lacking in confidence, you can say _______.( )
A.
Take your time.
B.
You can make it.
C.
You are a coward.
D.
You are very brilliant.
【单选题】When your friend won the football match, you should say______
A.
Good for you.
B.
That’s OK.
C.
How wonderful!
【单选题】When your friend told you that you’ve got the scholarship, you may say:_______by showing your surprise.
A.
That’s not true.
B.
Are you serious?I can’t believe it.
C.
You must be making fool of me .
【简答题】3.Students should try to strike a balance
between listening, understanding and notes.A.B.C.D.E.F.G. G
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