船舶自用的危险物品要集中存放于专门的物料间。（）和乙炔气瓶要分开存放，保持安全距离。
A、氧气
B、氯气
C、天燃气
D、润滑油
参考答案：A
－To keep safe, everyone_______ wear a seat belt(安全带) in a car.
A. is suppose B. are supposed to C. is supposed to D are supposed
