问题
选择题
| What happens to a person if he loses _____ of his blood (血)? |
A. three fourth B. one thirds C. two third D. two thirds |
答案
答案：D
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| What happens to a person if he loses _____ of his blood (血)? |
A. three fourth B. one thirds C. two third D. two thirds |
答案：D
绘出夜半球的范围。此时，太阳直射点的纬度是 ，广西昼夜长短情况是 ，地球上出现极昼现象的范围是 。