One of the most important problems they had to consider was________of public health.
#14614
A
what
B
this
C
that
D
which
推荐题目
(2013·高考天津卷)At our factory there are a few machines similar to ________ described in this magazine.
#14836
A
them
B
these
C
those
D
ones
The cells of humans, especially _____of the brain, can live only minutes without circulating blood.
#15399
A
that
B
ones
C
it
D
those
-----Which of these electronic dictionaries do you like most ? -------________.They’re both expensive and of little use.
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A
None
B
Neither
C
All
D
Both
Like the Olympics, the World Cup takes place _____ years.
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A
every four
B
each fourth
C
each four
D
every fourth