在阶级社会中,真理的根本属性是 A. 阶级性 B. 客观性 C. 主观性 D. 相对性
What you said just now ____ the matter we are discussing. A. have something to do at B. has something to do with C. had something to do with
---Mary’s score on the test is the highest in her class. ---Really? She ______ have studied very hard. A. may B. ought to
X、Y、Z是ⅠA--ⅦA族的三种非金属元素,它们在周期表中的位置如右图所示。试完成下列问题: (1)X元素单质的化学式是__________。 (2)Y元素的原子结
I would _____ it if you come to my grandma’s birthday party and say “Hello” to her. A. associate B. appreciate C. impress D. congratulate
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。下列属于未来新能源标准的是( ) ①天然气 ②煤 ③核能
下列检验离子的方法及结论正确的是( )。A.向某溶液中滴加AgNO3溶液后产生白色沉淀,说明原溶液中含有Cl-B.向某溶液中滴加BaCl2溶液后产生白色
以下烃中二氯代物只有两种的是( ) A.(CH3)2CHCH3 B.CH3CH2CH3 C. CH3CH2CH2CH3 D.C(CH3)4