题型：问答题 简答题 完形填空。 This is a photo 1 Robert's 2 . 3 Robert. He is a student 4 Grade 1 5 No. 6 Middle School. The girl 6 an orange skirt is Ann, Robert's sister. The woman behind Robert is Mrs. Shute. She is Robert's mother. She is a teacher, but she teaches in 7 school. Mrs. Shute is standing 8 his daughter. He is working 9 a car factory. Robert's parents 10 young. This is a nice picture. ( )1. A. to ( )2. A. family ( )3. A. It's ( )4. A. of ( )5. A. on ( )6. A. with ( )7. A. the same ( )8. A. behind ( )9. A. to ( )10. A. look like B. about B. home B. He's B. at B. about B. in B. same B. under B. for B. look the same C. of C. house C. Here's C. with C. at C. put on C. different C. on C. with C. look D. for D. room D. That's D. for D. in D. wear D. a differentD. in front ofD. in D. looks 查看答案
题型：问答题 简答题 图示单摆由无重刚杆OA和质量为m的小球A构成。小球上连有两个刚度为k的水平弹簧，则摆微振动的固有频率应为：（）A.（k／m）1/2B.（2k／m）1/2C.（g／L+2k／m）1/2D.（g／L+k／m）1/2 查看答案
