A:①②
B:②③
C:③④
D:①④
— She is hard-working. She ________ all her effort into her work before she got ill.
①Al ②Al2O3③Ca(OH)2④Al(OH)3⑤Na2CO3⑥NaHCO3.
刚升入初中的王海,在回家的路上遇到同班同学张群被几个社会青年围劫。你认为此时王海正确的做法是( )
①与坏人奋勇搏斗 ②在确保自身安全的前提下,做力所能及的事
③记住坏人特征,及时向公安机关报告 ④保护好自己是一切的前提