问题
选择题
—LiYang is a hard-working boy.
—I agree. But he shouldn't _______ too late at night, or he'll be stressed out. [ ]
A. look up
B. stay up
C. make up
D. wake up
答案
答案：B
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—LiYang is a hard-working boy.
—I agree. But he shouldn't _______ too late at night, or he'll be stressed out. [ ]
A. look up
B. stay up
C. make up
D. wake up
答案：B
（2010·重庆·1９）氢原子分能级示意图如题19所示，不同色光的光子能量如下表所示。
| 色光 | 赤 | 橙 | 黄 | 绿 | 蓝—靛 | 紫 |
| 光子能量范围（eV） | 1.61~2.00 | 2.00~2.07 | 2.07~2.14 | 2.14~2.53 | 2.53~2.76 | 2.76~3.10 |
处于某激发态的氢原子，发射的光的谱线在可见光范围内仅有2条，其颜色分别为（ ）
红、蓝靛
黄、绿
红、紫
蓝靛、紫