完形填空。
A is a new student. Mr. Wang is asking him some questions.
W: are new here, am I right?
A: Yes, you are right, Mr. Wang.
W: 1 ?
A: Yes, what are they?
W: 2 ?
A: On July 14, 1983.
W: Where were you born?
A: I was born in Sydney in Australia.
W: 3 ?
A: For about eight years.
W: And 4 ?
A: They were born in Sydney, too.
W: Are they living in China?
A: 5 . He is coming soon.
( )1. A. May I ask you some questions
B. Shall I ask you any questions
C. Can you ask me any questions
D. Do you have any questions
( )2. A. Where were you born
B. When were you born
C. Who was born on July 14, 1983
D. Were you born on July 14, 1983
( )3. A. How often did you live there
B. How did you live there
C. Why did you live there
D. How long did you live there
( )4. A. Were your parents born in Sydney, too
B. Who were born in Sydney
C. Where were your parents born
D. When were your parents born
( )5. A. Mum is, but Dad works in Sydney
B. Mum does, but Dad works in Sydney
C. Dad is, but Mum works in Sydney
D. Dad does, but Mum works in Sydney
时（T为交流的周期），原线圈中的电流瞬时值为0.03A．变压器的原、副线圈的匝数比为（ ）
：3