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【单选题】
When you start exercising, you should walk___.
A.
twenty to thirty minutes a day
B.
five miles a day
C.
a few minutes a day
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参考解析：
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举一反三
【单选题】When you start exercising, you should walk___.
A.
five minutes a week
B.
every day
C.
three times a week
【单选题】Some people don't know how to start exercising, so they___.
A.
never exercise
B.
exercise only sometimes
C.
hardly ever exercise
【单选题】Isabel plays tennis ___.
A.
three times a week
B.
five times a week
C.
four times a week
【单选题】Bob goes swimming ____.
A.
one hour a week
B.
three times a week
C.
one hour a day, four times a week