岩石按成因分为岩浆岩、沉积岩和变质岩，下列属于变质岩的是（）。
A. 花岗岩
B. 大理岩
C. 石英岩
D. 灰岩
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The pine trees were black _______ the morning sky.
A. against
B. under
C. in
D. beneath
May I have the ______ of dancing with you？
A. delight
B. pleasure
C. approval
D. agreement
He didn't understand the point, ______ I had to explain further.
A. which
B. while
C. whereupon
D. that
After practicing for one month, I ______ the conclusion that I didn't really fancy civil engineering.
A. derived from
B. came to
C. built up
D. based on
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