单项选择题

Why are some of us good at math, or writing, while others（）at art or basketball

A. work
B. gaze
C. aim
D. excel

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单项选择题
All parts of this machine are（） , so that it is very simple to get replacements for them.

A. specialized
B. standardized
C. minimized
D. modernized
单项选择题
The frequent（）from cold to warm weather this spring have caused much illness.

A. transmissions
B. transactions
C. transformations
D. transitions
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