单项选择题

Scientists are working hard to come up with a sure solution to the food ()for mankind.

A．decline
B．rarity
C．scarcity
D．shortage

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单项选择题
He cut the string and held up the two ()to tie the box.

A．segments
B．sediments
C．seizures
D．secretes
单项选择题
Communicating orally involves more than reading or talking: gesture, posture, movements may all be () to it.

A．intrinsic
B．coherent
C．appealing
D．submissive
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