单项选择题

Babies will not be stimulated to smile by a person______

A．whose front view is fully perceived
B．whose face is covered with a mask
C．whose face is seen from the side
D．whose face is free of any covering
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单项选择题
To keep a conversation flowing smoothly, it is better for the participants______
A．not to wear dark spectacles
B．not to make any interruptions
C．not to glance away 'from each other
D．not to make unpredictable pauses
单项选择题
From the third paragraph we know that______
A．Iran has the technology of producing Scud missile
B．some countries could send long-range missile right after they decide to do so
C．Iraq can not become a missile threat to America now
D．both A and C
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