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【判断题】
Anyone can perform. miracles so long as he concentrates something; but television discourages concentration. ()A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】心瓣膜病(valvular Vitium of the heart)
【单选题】【3+2天天练 第60天】下列哪一个选项是空缺处的最佳答案。As soon as he ______ the gate from the outside he comes into the garden.
A.
will open
B.
opens
C.
is opening
D.
has been opening
【单选题】【3+2天天练 第60天】下列哪一个选项是空缺处的最佳答案。Rex became an expert. He was very ______.
A.
crafty
B.
sly
C.
cunning
D.
skilful
【单选题】【3+2天天练 第60天】下列哪一个选项是空缺处的最佳答案。My husband spent weeks ______ him to press his paw on the latch.
A.
teaching
B.
guiding
C.
leading
D.
conducting
【简答题】工业尾气中氮氧化物的去除技术有哪些
【单选题】假设某企业生产甲、乙、丙三种产品,各产品的贡献边际率分别为10%、15%、30%,销售比重分别为30%、30%、40%,则该企业综合的加权贡献边际率是( )
A.
55%
B.
19.5%
C.
15%
D.
30%
【单选题】【3+2天天练 第60天】下列哪一个选项是空缺处的最佳答案。He would bark until someone opened the gate. That's what he ______.
A.
is used to doing
B.
used
C.
is used to
D.
used to do
【简答题】心瓣膜病(valvular vitium of the heart)(名词解释)
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