单项选择题

With age, the mineral content of human bones decreases, （）them more fragile.

A. make
B. and to make
C. thereby making
D. which it makes

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He is too shy to ask a stranger the time, ______ speak to a room full of people.
A. much more
B. much as
C. still less
D. still as
单项选择题
Which of the following sentences is a COMMAND（）

A. Be quiet, please.
B. Go there right away!
C. Watch your steps !
D. Have a really good meal!
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