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【单选题】
细胞中进行呼吸作用的主要结构是（ ）A.
细胞膜
B.
细胞核
C.
细胞质中的叶绿体
D.
细胞质中的线粒体
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反馈参考答案：
举一反三
【简答题】Please hold on
to your dream one day it
comes true.A. if B. until C. unless D. though
【简答题】As one comes to some crossroads, he or she sees a sign which says that drivers have to stop when they come to the main road ahead. At other crossroads, drivers have to go slow, but they do not actuall...
【单选题】Please hold on to your dream one day it comes true.
A.
if
B.
until
C.
unless
D.
though
【简答题】Please hold on to your dream ____one day it comes true.
【单选题】根据以下资料，回答1~4题。 As one approaches some crossroads, one comes to a sign which says that drivers have to stop when they come to the main road ahead．At other crossroads, drivers have to go slow, but they ...
A.
there is s stop sign
B.
there is a slow sign
C.
you are on the main road
D.
you are on the crossroad
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