II Here’s a paragraph that has both facts and opinions. Read and decide whether they are facts or opinions. New York and other U.S. cities have begun using vehicles powered by natural gas[1]. This is a good idea[2]. Vehicles that use natural gas do not pollute the air[3]. Furthermore, natural gas is more cost-effective than regular gas[4]. All cities should use only vehicles powered by natural gas[5].1. Facts are _________
选项：

A:[ 1];
B:[2] ;
C:[3] ;
D:[4] ;
E:[5]