完形填空。Myschoolhasabout3000studentsinsixgr
题型：完形填空
问题：
| 完形填空。 | |||
| My school has about 3000 students in six grades — grade seven to 1 . It has 200 teachers and 70 classrooms. I go to school at 6: 30 a. m. 2 bike. My school starts at 7 o'clock. Everyone must go to school 3 it starts. I have seven classes in a day, four in the morning and three in the 4 . After class 4 everyone goes to have lunch in the canteen. Not many students bring food to school because the food in the canteen is 5 . Class 5 starts at 2: 00 p. m. and class 7 finishes at 4:30. After class 7 some people go home, some 6 at school. The most popular sport at school is basketball. I usually go home 7 5: 00 p. m. because I go to play football and basketball at my school 8 go to learn English with my teacher there. After that I go home by bike. When I 9 home, I clean my home every day, then I go to 10 a shower and do my homework. | |||
| ( )1. A. ten ( )2. A. by ( )3. A. after ( )4. A. morning ( )5. A. small ( )6. A. stay ( )7. A. at ( )8. A. but ( )9. A. go ( )10. A. take | B. eleven B. on B. when B. noon B. cheap B. play B. on B. and B. leave B. make | C. twelve C. in C. while C. afternoon C. delicious C. work C. in C. so C. get C. like | D. thirteen D. for D. before D. evening D. clean D. live D. about D. or D. come D. love |
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