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【单选题】
下面对Mask 的作用描述不正确的是：A.
通过 Mask ，可以对指定的区域进行屏蔽。
B.
某些 Effect 需要根据 Mask 发生作用。
C.
产生屏蔽的 Mask 必须是封闭的
D.
应用于效果 Effect 的 Mask 必须是封闭的
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【单选题】What is the theme of the story?
A.
A friend in need is a friend indeed.
B.
United we stand, divided we fall.
C.
Two heads are better than one.
D.
Save yourself, or save another.
【单选题】What is the theme of the dialogue?
A.
It is very convenient to drive a car.
B.
Driving is very popular in modern society.
C.
Driving a car can cause a lot of traffic problems.
D.
Riding bikes is good for the environment.
【单选题】What is the theme of the passage?
A.
People who are blind still have the courage and willpower to overcome their difficulties.
B.
Blind people can still find beauty in life although they cannot enjoy the sights of the world.
C.
Blind people are still optimistic about life although they cannot see the world around them.
D.
People who are blind still can enjoy themselves if they do things that don't involve sight.
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