关于地球自转的周期和速度的叙述正确的是
A．地球自转360°所需的时间为24小时，这叫做1个太阳日
B．地球自转一周360°称为1个恒星日
C．地球上各地自转的角速度都为每小时15°
D．地球自转的线速度总是纬度高的地方大于纬度低的地方
答案：B
本题考查地球自转的周期和速度。地球自转360°，时间为23时56分4秒，称为恒星日，
昼夜更替周期为24小时，称为太阳日；角速度，除极点为0外，其它各点均为15°/小时，线速度，自赤道向极点逐渐减小为0。所以本题选择B选项。
| 阅读理解。 | |||
| |||
| 1. Sunny English Club is for ______. | |||
| A. nurses B. policemen C. businessmen D. students | |||
| 2. You will pay ______ if you want to stay in the English club for half a year. | |||
| A. 300 yuan B. 600 yuan C. 1,200 yuan D. 2,400 yuan | |||
| 3. You can visit Ocean Museum ______. | |||
| A. on Saturday B. on Wednesday C. on Monday D. anytime | |||
| 4. One can get free examinations in Health Centre if he is ______. | |||
| A. 9 B. 17 C. 67 D. 73 | |||
| 5. If you are interested in the life of fish, you should go to ______. | |||
| A. Health Centre B. Ocean Museum C. Sunny English Club D. 16 Yong Le Street |