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【单选题】
We should try a good way to keep ______ teachers______ students ______. [ ]A.
both; and; happily
B.
either; or; happy
C.
all; and; happily
D.
both; and; happy
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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】的平方根是（ ）；81的算术平方根是（ ）； 的平方根是（ ）。
【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______．
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