问题
选择题
Babies are not born with __ moral sense; they cannot tell __ difference between right and wrong.
A.a 不填
B.不填;a
C.a; the
D.the; the
答案
答案:D
Babies are not born with __ moral sense; they cannot tell __ difference between right and wrong.
A.a 不填
B.不填;a
C.a; the
D.the; the
答案:D
某化合物可能由碳、氢、氧三种元素中的两种或三种组成.现有1.6g该化合物在足量的氧气中完全燃烧,生成物依次通过装有浓硫酸和氢氧化钠的容器.反应前后容器的质量见下表.
容 器 | 实验前 | 实验后 |
甲(实验前装有浓硫酸) | 140g | 143.6g |
乙(实验前装有氢氧化钠溶液) | 180g | 184.4g |
A.一定含有碳、氢、氧三种元素
B.只含有碳、氧两种元素
C.一定含有碳、氢两种元素,可能含有氧元素
D.只含有碳、氢两种元素