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【单选题】
一般对在群体检疫中无病的动物也要按照 抽样做个体检疫。A.
5%-20%
B.
5%-15%
C.
10%-15%
D.
15%-20%
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反馈参考答案：
举一反三
【简答题】Runners in a relay race pass a stick in one direction. However, merchants passed silk, gold, fruit, and glass along the Silk Road in more than one direction. They earned their living by traveling the ...
【单选题】Which one is the key to making silk?
A.
Animals' carefulness.
B.
The water content in its silk glands.
C.
The proteins.
D.
The mulberry leaves
【单选题】根据以下材料，回答题 New Understanding of Natural Silk's Mysteries Natural silk， as we all know， has a strength that manmade materials have long struggled to match. In a discovery that sounds more like an ancie...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】She removed ________ hat she was wearing and tried on ________ black silk one. [ ]
A.
a; a
B.
the; the
C.
the; a
D.
a; the
【简答题】One can not make a silk purse out of a sow’s ear.
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