单项选择题

A．procedure
B．means
C．technique
D．approach
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单项选择题
A．easyB．safeC．lightD．large
A．easy
B．safe
C．light
D．large
单项选择题
A．As a resultB．MoreoverC．HoweverD．In addition
A．As a result
B．Moreover
C．However
D．In addition
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