单项选择题

During the past ten years there have been dramatic changes in the international situation.

A. permanent
B. powerful
C. striking
D. practical
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Medicine depends on other fields for basic information, particularly some of their specialized branches.
A. conventionally
B. obviously
C. especially
D. inevitably
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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