单项选择题

Genes determine ______ the shape of a leaf and the sex, height, and hair color of a child.

A. such as features
B. such features as
C. as such features
D. features, as such
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单项选择题
He was so ______ on his book that he didn't find her come in.
A. intent
B. absorbed
C. engrossed
D. devoted
单项选择题
Though computer has many advantages, it is by no means without its ______.
A. limitations
B. refrain
C. confinements
D. boundaries
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