问题
选择题
一个半径为5m的圆形蓄水池装满水，水面和地面相平，在池中心正上方离水面3m高处吊着一盏灯，一个人站在岸边，他的眼睛距地面的高度为1.8m，则他要看到灯在水中所成的像，人到岸的距离不能超过
A．1m
B．2m
C．3m
D．4m
答案
C
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一个半径为5m的圆形蓄水池装满水，水面和地面相平，在池中心正上方离水面3m高处吊着一盏灯，一个人站在岸边，他的眼睛距地面的高度为1.8m，则他要看到灯在水中所成的像，人到岸的距离不能超过
A．1m
B．2m
C．3m
D．4m
C
| 选词填空。 | |
2.I often _____ at 11:00 because I have lots of homework. 3. Don't _____ your hope. 4. Are you _____ the movie? 5. My parents _____ everything I do. 6. _____ the princess woke up and got married to the prince. . 7. _____ he is a kind teacher, we are all afraid of him. 8. The woman _____ be a history teacher. Now she's retired. 9. It's hard for me to _____. 10. _____, the boy stole some money from his mother. |