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【单选题】
边际效用递减规律说明A.
随着某种商品消费量的增加，该商品的总效用有下降趋势
B.
随着某种商品消费量的减少，该商品的总效用有下降趋势
C.
随着收入的增加，边际效用有下降趋势
D.
随着某种商品消费量的增加，该商品的边际效用有下降趋势
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举一反三
【单选题】I used to have a _______ to that vase, but I broke it the other day. [ ]
A.
company
B.
companion
C.
community
D.
accompany
【单选题】According to the passage， the use of other metals in gold alloys________. I . can be used to make the gold different color Ⅱ. makes jewelry more expensive Ⅲ. makes gold more flexible 查看材料
A.
I only
B.
Ⅰ and Ⅱ only
C.
Ⅱ and Ⅲ only
D.
I ，Ⅱ，and Ⅲ
【单选题】According to the author, small talk is often used______．
A.
to invade other's private affairs
B.
to share a secret between intimate friends
C.
to open and maintain channels of communication
D.
to protect one's own privacy
【简答题】Professor Lee’s book will show you can be used in other contexts．
【单选题】-----What’s your hobby? -----I _______ listen to music, but now I enjoy dancing.
A.
am used to
B.
used to
C.
am used
【单选题】新型冠状病毒肺炎的主要传播途径为
A.
消化道传播和血液传播
B.
呼吸道飞沫和消化道传播
C.
呼吸道飞沫和气溶胶
D.
气溶胶和消化道传播
E.
呼吸道飞沫和接触传播
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