单项选择题

Gold has been highly prized throughout the ages due chiefly to（）

A. it is scarce
B. so scarce is it
C. its scarcity
D. scarcity of it

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You'll run （）trouble if you don't take care.

A. down
B. at
C. across
D. into
单项选择题
（）the knowledge, he didn't know how to ask the way.

A. Knowing not
B. Having not known
C. Not knowing
D. Not to know
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