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【判断题】
某物质只要具有酸性，不管其酸性强弱，都可用氢氧化钠标准溶液直接滴定，测出其含量。（ ）A.
正确
B.
错误
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举一反三
【单选题】As a librarian, she spends most of her time ______ books on the shelves every day.
A.
arranging
B.
selling
C.
controlling
D.
borrowing
【单选题】He spends most of his spare time ________English.
A.
to study
B.
on study
C.
on studying
D.
studying
【单选题】Mariangela currently Spends most of her time working with
A.
food.
B.
customers.
C.
money.
【单选题】Laura, who comes from a wealthy family, spends most of her time enjoying herself, but takes ______ pains with her lessons.
A.
little
B.
few
C.
a little
D.
a few
【单选题】The artist spends most of his spare time ___ butterfly specimens.
A.
collect
B.
collects
C.
to collect
D.
collecting
【单选题】My sister spends _____ studying so that she might later get a better job .
A.
most of her times
B.
her most times
C.
her most time
D.
most of her time
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