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【简答题】
A．A very popular food plant: B．A plant with limited uses. C．A food plant which has been thoroughly used. D．A plant used as a main food on the Pacific Islands.
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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】To explain the effect of trenches, the writer gives the example of
A.
the sea floor in the Atlantic Ocean.
B.
the Himalayan Mountains.
C.
Europe.
D.
India.
【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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