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【简答题】
请简要阐述本词的写作背景?
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following is NOT described in the passage?
A.
Whales migrate to breed and give birth to their young.
B.
Whale-watching in Boston in summer is attracting.
C.
Seals breed in the north before migration.
D.
Reindeer feed on grass.
【简答题】16 的算术平方根是 ; 的算术平方根是 ; 81 的算术平方根是 ; 的算术平方根是 ,
【单选题】It is as risky as the natural evolution of the virus that the scientists breed contagiousness into H5N1 to see if it is likely to happen.
A.
Y
B.
N
C.
NG
【简答题】2 1 4 的算术平方根是______，9 2 的算术平方根是______， 81 的算术平方根是______．
【简答题】A．reign B．alter C．chock D．breed
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