问题
选择题
My brother is good at _ model planes. [ ]
A. make
B. making
C. made
D. to make
答案
答案：B
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My brother is good at _ model planes. [ ]
A. make
B. making
C. made
D. to make
答案：B
按要求填写下表．
| 日期 | 节气 | 太阳光直射纬度 | 北半球昼夜时间长短 |
| 3月21日前后 | ______ | ______ | ______ |
| 6月22日前后 | ______ | ______ | ______ |
| ______前后 | 秋分 | ______ | ______ |
| ______前后 | 冬至 | ______ | ______ |