问题
选择题
He doesn’t do his homework________. So he always makes some mistakes.
A.careful enough
B.enough careful
C.carefully enough
D.enough carefully
答案
答案:C
修饰动词do要用副词carefully,且enough要放在所修饰的副词后面,所以选C。
He doesn’t do his homework________. So he always makes some mistakes.
A.careful enough
B.enough careful
C.carefully enough
D.enough carefully
答案:C
修饰动词do要用副词carefully,且enough要放在所修饰的副词后面,所以选C。
除去下列物质中所含的少量杂质,下表除杂方法正确的是( )
选项 | 物质 | 所含杂质 | 除杂质的方法 |
A | 氧化铜 | 氯化钠 | 加水溶解、过滤、蒸发结晶 |
B | 氧气 | 水蒸气 | 通过盛有浓硫酸的洗气瓶 |
C | 硫酸钠溶液 | 稀硫酸 | 加入过量碳酸钠溶液,过滤 |
D | 氧化钙 | 碳酸钙 | 高温充分灼烧 |
A.A
B.B
C.C
D.D