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【单选题】
对于经常进行运动人群的最大心率的计算方法,以下哪种方法是正确的( )A.
220-年龄
B.
210-年龄
C.
220-年龄*0.8
D.
210-年龄*0.8
E.
170-年龄
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举一反三
【简答题】How long has this been going on?
【单选题】—How long has this bookstore been in business? —_______ 1996.
A.
After
B.
In
C.
From
D.
Since
【单选题】How long has this study been ongoing at the point of this speech?
A.
75 years
B.
58 years
C.
65 years
D.
47 years
【单选题】听力原文：M: Now, then, Mrs. Darcy. How long has this tooth been giving you trouble? W: Well, I had it filled last year and was all right until last Sunday. Then it started hurting again. Q: How long has t...
A.
For a few days.
B.
For several weeks.
C.
Since last year.
D.
For a few hours.
【单选题】— How long has this bookshop been in business?
A.
____ 1982.
B.
After
C.
In
D.
From
E.
Since
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