Bike Rentals      Thank you for your interest in the iBike system! Use your metro card to rent a bike and then drop it off at any other station around the city.    First things first  , place your card on the reader below. If there’s a problem, please see the instructions below. 

rental 租賃 、 metro card 捷運卡 、 instruction 指示 、 error code 錯誤代碼 、register 註冊 、 balance 餘額 、 sufficient 足夠的 、 unavailable 無法利用的
【題組】55. How should someone fix Error Code 4?
(A) Try another card.
(B) Wait two minutes.
(C) Add money to your card.
(D) Register your card.