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【单选题】
下列关于近端小管重吸收的叙述，正确的是A.
Na\r\n + \r\n为主动或被动重吸收
B.
C1\r\n - \r\n为主动重吸收
C.
K\r\n + \r\n为被动重吸收
D.
\r\n为主动重吸收
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举一反三
【简答题】A．He found it unbelievable. B．He was not surprised about it. C．He found the troth unacceptable. D．He was arrogant about it.
【单选题】What did he find on the way?
A.
He found a rich person.
B.
He found a box of good apples.
C.
He found an apple tree.
【单选题】Although it is the first time he takes up such a big task, never ______ afraid of difficulties.
A.
he has been
B.
has he been
C.
has been he
D.
been has he
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