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【單選題】
通常情況下，細胞外液和細胞內液Na+和K+濃度的差別主要由什么產生和維持（ ）
A.
滲透壓
B.
鈉—鉀泵
C.
離子通道
D.
酸堿度
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舉報參考答案：
舉一反三
【單選題】The fruit has been setting there for ten days and now is giving off a ______ smell，so we must throw it away.
A.
sweet
B.
sour
C.
horrible
D.
salty
【單選題】It is ______ that we can’t finish it on time.
A.
so a hard job
B.
such hard a work
C.
such a hard job
D.
so hard a work
【單選題】Our teacher ______ himself to teaching, so we should study hard to repay him.
A.
devotes
B.
engages
C.
addicts
D.
attributes
【單選題】When both of my parents ______ London, I had no one to depend on.
A.
have gone to
B.
had been to
C.
have been to
D.
had gone to
【單選題】He found that his house had been ______ and some important files were lost.
A.
broken into
B.
taken out
C.
made into
D.
run out
相關題目：
【單選題】The fruit has been setting there for ten days and now is giving off a ______ smell，so we must throw it away.
A.
sweet
B.
sour
C.
horrible
D.
salty
【單選題】It is ______ that we can’t finish it on time.
A.
so a hard job
B.
such hard a work
C.
such a hard job
D.
so hard a work
【單選題】Our teacher ______ himself to teaching, so we should study hard to repay him.
A.
devotes
B.
engages
C.
addicts
D.
attributes
【單選題】When both of my parents ______ London, I had no one to depend on.
A.
have gone to
B.
had been to
C.
have been to
D.
had gone to
【單選題】He found that his house had been ______ and some important files were lost.
A.
broken into
B.
taken out
C.
made into
D.
run out
參考解析：
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