单项选择题
A.Public buses are fast and cheap. B.Parking is becoming a big problem. C.Subway trains are even safer than taxis. D.Taxis are more convenient than buses.
A.2 B.5 C.7 D.6
A.entering the United States legally. B.freezing US financial assets abroad. C.receiving support from other countries. D.giving weapons to other terrorist groups.