下列除去杂质（在括号内）选用的试剂（在箭头右侧）错误的是（ ）
A：CO2气体（H2O）→生石灰
B：C粉（CuO）→稀盐酸
C：CaCl2溶液（HCl）→碳酸钙粉末
D：CO气体（CO2）→氢氧化钠溶液
静止的氡核 86222 Rn放出α粒子后变成钋核 84218 Po，α粒子动能为Eα．若衰变放出的能量全部变为反冲核和α粒子的动能，真空中的光速为c，则该反应中的质量亏损为（ ）
have, at, like, usually， watch, homework, after, play, come
I have a friend. His name is Li Daming. He often gets up ____ six o'clock in the morning. He ____ breakfast at seven. He goes to school five days a week. After school，he ____ plays games for half an hour. Look! What is he doing？He is ____ basketball. In the evening he does his ____ and he likes listening to music. He often ____TV for half an hour____ he finishes his homework. He goes to bed at ten o'clock. Do you ____ him?
利用人工合成的性引诱剂诱杀害虫的雄性个体，破坏了种群正常的性别比例，该害虫的种群密度将（ ）
