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【单选题】
From the last paragraph, we can reasonably conclude that offering discounts willA.
inevitably attract more people to travel on their booked flights.
B.
provoke a new 'price battle' among airliners.
C.
ultimately change the habit of booking a flight and then failing to turn up.
D.
most probably pose a new problem on air fares.
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皮皮学刷刷变学霸
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【简答题】Why do conventional models of the atmosphere fail to predict such a short-lived tornado?
【单选题】The real reason why prices ____ ， and still are， too high is complex， and no short discussion can satisfactorily explain this problem.
A.
Were
B.
will be
C.
have been
D.
had been
【单选题】What is the fifth paragraph mainly about?
A.
Why people become short-sighted.
B.
Why natural light has a special chemical.
C.
Why playing outside is good for one’s eyesight.
D.
Why daylight is much brighter than indoor light.
【简答题】1森林培育学是研究（）和培育森林的理论和技术的科学。
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