試題詳解

42. Which of the following is TURE about a bicycle-sharing system?
(A)Its major purpose is to provide people with more opportunity to exercise.
(B) It became more common and better developed in the 20st century.
(C)It has long been troubled with stolen bikes since it first started.
(D) It was available in over 700 cities in 50 countries as of June 2014.