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【單選題】
“人類不能生活在純氧的環境中”，這一敘述是（ ）
A.
不對的，因為身體細胞需要氧，以氧化有機物獲得能量
B.
不對的，因為人體所吸收的純氧經呼吸道進入血液時，已有許多CO2產生，不影響呼吸的調節。
C.
對的，因為血液中應有適量的CO2作為調節呼吸作用的物質
D.
對的，因為純氧會使身體細胞的氧化作用太劇烈，而無法維持恒定性
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舉報參考答案：
舉一反三
【單選題】That hero who died in the war was so brave that he never ________ to the enemies until death.
A.
gave up
B.
gave out
C.
gave in
D.
gave away
【單選題】Yesterday we went to visit the farm ________ my father used to work for nearly ten years.
A.
in which
B.
that
C.
where
D.
which
【單選題】Every time ________ they met, they would talk several hours together about the persons and things ________ they remembered in the middle school.
A.
that; who and which
B.
when; which
C.
which; /
D.
/; that
【單選題】Unless you change your ________ towards your studies, you won’t make any progress, I believe.
A.
point
B.
idea
C.
sight
D.
attitude
【單選題】Mr. Black ________ Shanghai in a few days. Do you know when the earliest plane ________ on Sunday？
A.
leaves; takes off
B.
is leaving; takes off
C.
is leaving; is taking off
D.
leaves; is taking off
相關題目：
【單選題】That hero who died in the war was so brave that he never ________ to the enemies until death.
A.
gave up
B.
gave out
C.
gave in
D.
gave away
【單選題】Yesterday we went to visit the farm ________ my father used to work for nearly ten years.
A.
in which
B.
that
C.
where
D.
which
【單選題】Every time ________ they met, they would talk several hours together about the persons and things ________ they remembered in the middle school.
A.
that; who and which
B.
when; which
C.
which; /
D.
/; that
【單選題】Unless you change your ________ towards your studies, you won’t make any progress, I believe.
A.
point
B.
idea
C.
sight
D.
attitude
【單選題】Mr. Black ________ Shanghai in a few days. Do you know when the earliest plane ________ on Sunday？
A.
leaves; takes off
B.
is leaving; takes off
C.
is leaving; is taking off
D.
leaves; is taking off
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