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【单选题】
飞行前检查氧气系统时氧气瓶释压膜片显示为红色，这表明（）A.
氧气瓶压力正常，可以起飞
B.
氧气瓶已释压，飞机不能放飞
C.
氧气瓶压力偏高，但可以起飞
D.
氧气瓶压力偏低，但可以起飞
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反馈参考答案：
举一反三
【单选题】What do we know about Saunders?
A.
He once worked at a school in Scotland.
B.
He followed Ridgway to explore the North Pole.
C.
He was chosen for the school sports team as a kid.
D.
He was the first Briton to ski alone to the North Pole.
【简答题】“玉不琢，不成器；人不学，不知道。是故，古之王者，建民，教学为先。”这段话出自下哪篇文章（ ）
【单选题】Tom had once worked in a city office in London, but now he is out of work. He had a large family to support, so he often found himself in difficulty. He often visited Mr. White on Sundays, told him ab...
A.
worked in a city office and was poorly paid
B.
was poorly paid and had a large family to support
C.
was poorly paid and always spent money carelessly
D.
was out of work and had a large family to support
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