Look and choose. 对号入座。
1. D 2. C 3. A 4. B
Paul’s wish is to become a pilot, ________?
A. isn’t he
B. is he
C. isn’t it
D. is it
某电气设备电压提高1倍,其功率提高()。
A、1倍
B、2倍
C、3倍
D、4倍