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单项选择题

A model was developed to simulate the river with _______ bed and banks composed of sandy materials.

A．erode
B．erosion
C．erosive
D．erodible
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多项选择题
花坛的功能包括哪些方面？
A．组织交通
B．分隔和屏障
C．美化环境
D．标志和宣传
单项选择题
An economic system in which business are allowed to produce any goods and services they wish to is referred to as ... A.
A centrally planned economy B.
market economy C.
A mixed economy D.
A private economy
多项选择题
借贷记账法下，账户的贷方登记( )。
A、资产增加
B、资产减少
C、负债增加
D、所有者权益减少
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