皮皮学，免费搜题
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【单选题】
听力原文：W: Oh dear, you are coming in and out, and I can not hear you clearly. M: Sorry baby, my battery is low. Ok, listen, I am going to be late tonight so don't stay up and wait for me. Q: What can we learn from the conversation? (15)A.
The woman could not hear the man out of office.
B.
The woman is going to stay up all night to wait for the man.
C.
The man isn't coming back tonight.
D.
The man's phone has almost run out of battery.
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皮皮学刷刷变学霸
举一反三
【单选题】已知一件外套价格 80 元,一本书价格 20 元,在某消费者关于这两种商品的效用最大化的均衡点上,这本书对外套的边际替代率为
A.
0.5
B.
0.25
C.
0.8
D.
0.75