地球公转时，下列说法正确的是（ ）
A．地轴的空间的指向是变化的
B．地轴与公转面成90°
C．公转面与自转面成23.5°
D．地轴与公转面成66.5°
地球围绕太阳公转时，地轴与公转轨道的平面成66.5°的固定倾角（地球公转轨道面与地球赤道面之间的交角是23.5°的固定倾角），即地球公转时，地轴是倾斜的，而且它的空间指向保持不变．根据题意．
故选：D．
| 阅读理解。 |
| One day, a little boy came to a shop and said to the shop assistant, "I want to buy twelve exercise- books of 10 cents and nine pencils of 15 cents, four pieces of rubbers of 20 cents. How much shall I pay?" The shop assistant wrote all numbers down on a piece of paper and calculated (计算). Then she said, "You should pay 3.35 dollars altogether." "If I give you 5 dollars, how much shall I get back?" "You'll get back 1.65 dollars. Shall I pack these things for you?" "No, I don't buy anything" the boy looked at the piece of paper and said politely. "This is my maths homework. Can I take the answer away?" |
| 1. _____ kinds of things are mentioned (提到) by the boy. A. One B. Two C. Three D. Four 2. The boy went to the shop _____. A. to buy something for his school B. to buy something for his home C. to see how many things the shop has D. to get an answer 3. Nine pencils of 15 cents is _____. A. $ 1.35 B. $ 1.65 C. $ 0.15 D. 2.15 4. The shop assistant asked the boy to pay _____ after she answered boy. A. nothing B. $ 3.35 C. $ 1.65 D. $ 5 5. the boy bought _____ at last. A. nothing B. nine pencils C. twelve exercise-books D. four pieces of rubbers |