9（）
A. grown ups
B. girls
C. boys
D. children
Rubber differs from plastics ______ it is produced naturally and not in file lab.
A. at that
B. in that
C. for that
D. with that
The selection implies that human beings differ from computers in that human beings （）.
A. make fewer errors
B. do not have to be programmed
C. work more quickly
D. understand their instructions
The secret to the Jacket"s good looks is a special （）.
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