What is the author’s main concern?
A.How to render automobiles pollution-free. B.How to make smaller and safer automobiles. C.How to solve the problem of traffic jams. D.How to develop an automated subway system.正确答案C
What is the author’s main concern?
A.How to render automobiles pollution-free. B.How to make smaller and safer automobiles. C.How to solve the problem of traffic jams. D.How to develop an automated subway system.正确答案C