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【单选题】
关于视网膜的叙述，下列哪正确的（）A.
中央凹是盲点
B.
视神经盘感光最敏锐
C.
睫状体部有感光作用
D.
虹膜部无感光作用
E.
以上都不对
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皮皮学刷刷变学霸
举一反三
【单选题】Henry felt so hungry that he ordered a double ______ of fish.
A.
piece
B.
part
C.
portion
D.
section
【单选题】How many _______ did you _______ last year ? [ ]
A.
operation, perform
B.
operate, perform
C.
operations, perform
D.
operating, perform
【单选题】The section that follows the introduction section in a research article is the method section, but what follows the introduction section in a review article is often the:
A.
main body section
B.
discussion section
C.
conclusion section
D.
references
【简答题】世界三大音乐教学法分别是什么?
【简答题】听力原文：Who will perform. on the concert? Who will perform. on the concert? A group of ______.
【单选题】Additional heat extraction from the exhaust gases can be effected by adding an _____ section to the unit in plants.
A.
air cooler
B.
economizer
C.
injector
D.
air blower
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