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【单选题】
存储上一次结果的特殊变量是A.
:
B.
_
C.
>
D.
#
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参考解析：
知识点：
皮皮学刷刷变学霸
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【单选题】What was the woman worried about?
A.
She would not survive the disease.
B.
She would not be able to pay for the medical bill.
C.
She would not be able to pay back Dr. Kelly's kindness.
D.
She would not spread her love to other people.
【单选题】在维持效用水平不变的前提下，消费者为增加一单位某种商品的消费数量时所放弃的另一种商品的消费数量，被称为（ ）。
A.
商品的边际替代率
B.
边际技术替代率
C.
边际报酬
D.
边际效用
【简答题】Reading comprehension. Students often meet with questions as follows: bullied by someone, worried about a weak subject, puzzled by family problems or concerned about pets at home. All the questions ab...
【简答题】What was Jim worried about? Jim was worried about his ______ in the park.
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