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while语句至少执行 次, do ... while语句至少执行 次
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【单选题】The author compares the effect of airliners on the environment and that of the cars and concluded that the effect of the former is less because the number of airplanes is much smaller than that of the...
A.
Y
B.
N
C.
NG
【简答题】以噬菌体为媒介的DNA转移是( )。A.转化 B.转导 C.接合 D.原生质体融合 E.转染 涉及形成短暂的二倍体菌细胞进行基因交换的是( )。A.转化 B.转导 C.接合 D.原生质体融合 E.转染 细菌直接摄取外源DNA的是( )。A.转化 B.转导 C.接合 D.原生质体融合 E.转染 通过性菌互连接沟通进行DNA转移的是( )。A.转化 B.转导 C.接合 D.原生质体融合 E.转染
【单选题】Would you mind my little sister while I am away? —Of course not.
A.
looking for
B.
looking at
C.
looking after
D.
looking forward to
【判断题】The price effect includes the income effect and the effect of changing preference.
A.
正确
B.
错误
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