— We could have walked to the station. It was so near.
— Yes. A taxi ____ at all necessary.
A:wasn't
B:had been
C:wouldn't be
D:won't be
下列选项是配制50g溶质质量分数为5%的氯化钠溶液的步骤,其先后顺序正确的是( )
未来新能源的特点是资源丰富,在使用时对环境无污染或污染很小,且可以再生.下列不属于未来新能源标准的是( )
①天然气 ②煤 ③氢能 ④石油 ⑤太阳能 ⑥生物质能 ⑦风能.
— your father?
—He's a teacher.
钩 ____ ____ ____
挑 ____ ____ ____
错 ____ ____ ____
攻 ____ ____ ____
伙 ____ ____ ____
容 ____ ____ ____