单项选择题

A new system of quality control was brought in to overcome the defects in the firm's products.()

A. invested
B. introduced
C. installed
D. insisted

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单项选择题
Talks on climate change resumed in the German city of Bonn on July 16 to combat global warming.()

A. focus on
B. settle down
C. fight against
D. sum up
单项选择题
He inquired whether it was possible to leave his suitcase at the railway station.()

A. insisted
B. suggested
C. asked
D. called
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