取消
单选题


Scientists in Brazil have used frog skin to
A.eliminate bacteria.
B.treat burns.
C.speed up recovery.
D.reduce treatment cost.
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单选题

What is NOT a feature of the new karaoke machine?
A.It is featured by high technology.
B.It allows you to imitate famous singers.
C.It can automatically alter the tempo and tone of a song.
D.It can be placed in specially designed theme rooms.
单选题

China’s Internet users had reached__________by the end of June.
A.68 million
B.8.9 million
C.10 million
D.1.5 million
单选题

According to the WT0,Chinese exports rose__________last year.
A.21%
B.10%
C.22%
D.4.73%