读黄赤交角示意图，回答下列问题。
若黄赤交角为20°，下列现象正确的是（双选）（）
A.太阳直射点回归运动所需的时间减少
B.北纬20°纬线成为北回归线
C.直射点在南、北纬20°之间作回归运动
D.赤道上获得的太阳辐射能减少
参考答案：B, C
解析：
若黄赤交角为20°，南北回归线的纬度降低，分别为南北纬20°，太阳直射点的移动范围收窄，在南、北纬20°之间作回归运动。但公转周期不变，太阳直射点回归运动所需的时间不变，赤道上获得的太阳辐射不会减少。故选B.、C。
考点：本题考查地球运动的地理意义。
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