当被告知有重度颠簸时乘务员不必须对客舱广播()
A. 客舱乘务员应立即停止服务
B. 尽量将餐车推回服务间固定好
C. 将餐车上的热饮放在餐车内
D. 就近入座
The fear of smallpox, which terrorized the eighteenth century, has no analogy(likeness) today.()
A. occurrence
B. remnants 残留物
C. witnesses
D. parallel
Despite the proliferation of other faster modes of transportation, the railroads remain the largest carriers of intercity freight in the United States.()
A. schemes
B. means
C. tracks
D. variables
The flower bud of a water lily 百合 opens at sunset since .its opening is triggered(commence) .by the decreased light.()
A. alleviated 减轻
B. endured
C. set off
D. covered up