案例《关注光污染》一课中，这一学年的研究主题是（）。
A、人与自然。
B、光与自然。
C、人与光。
D、光与城市。
参考答案：A
Miss Jones _______ music at Bardon School for five years when she was abroad and now
she is an actress.[ ]
A. taught
B. has taught
C. had taught
D. has been teaching
侧钻裸眼钻进时应注意哪几点？
