天然气是各种气体的混合物,其主要成分是各种碳氢化合物,其中()占绝对多数,一般含量都在80%左右。
A、甲烷
B、乙烷
C、丙烷
D、丁烷
参考答案:B
---It won’t take long to clean our school if all the students are willing to help.
---Yes, I think so. ________.
A.Too many cooks spoil the broth
B.Don’t put all your eggs in one basket
C.Many hands make light work
D.Every dog has its day
中国出产玉雕的地方有:()。
A.江苏
B.新疆和田
C.辽宁岫岩
D.台湾澎湖