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【单选题】
The entry doors are on the left side of the airplane. The galley service doors are on the right side of the airplane. The emergency exit doors are above the wings on both sides of the airplane.The cargo doors are on the right side of the airplane. 根据上文，回答问题： We usually borard the airplane from:A.
the right side of the airplane
B.
the top of the airplane
C.
the left side of the airplane
D.
the bottom of the airplane
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反馈参考答案：
举一反三
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【单选题】根据刘易斯二元结构理论,两要素在两个市场直接流动的根本原因是
A.
各地经济发展水平不同
B.
各地政策和机制不同
C.
要素价格或回报率在各地的差异
D.
各地发展阶段和任务不同
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A.
may
B.
can
C.
will
D.
shall
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