单项选择题

求作△ABC与平面四边形DEFG的交线MN，并判别可见性。请选出正确的投影图（单选）。
A、(a)
B、(b)
C、(c)

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单项选择题
The figure of speech for “Till a' the seas gang dry, my dear, And the rocks melt wi' the sun” is _____. A.
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多项选择题
What mistakes did Xiaoli make when receiving the phone call?
A、She put the receiver under her neck.
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C、She was playing music.
D、She was talking loudly in public.