What has changed since the introduction of AC？
A. Schools now have more male than female teachers.
B. Non-whites account for 40% of Texas's school teachers.
C. AC has turned a number of soldiers into teachers.
D. The percentage of teachers willing to work in inner city has risen.
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正确答案是（）
A. in effect
B. as a result
C. for example
D. in a sense
Tests have proved that caffeine affects the body by increasing the heart rate and rhythm,
A. in turn
B. in return
C. turn back
D. as a result
正确答案是（）
A. dilution
B. watering
C. mixture
D. thickening
正确答案是（）
A. compensate
B. make up
C. replenish
D. refill
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