完形填空（共20小题；每小题1.5分，满分30分）
阅读下面短文，从短文后面各题所给的四个选项(A、 B、C 和 D)中选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
Being a physician who flies much often, a lot of my time is spent on planes listening for that fearful “Is there a doctor on board?” announcement. I’ve been ________only once --- for a woman who had merely fainted(昏厥). But the ________ made me quite curious about how________this kind of thing happens. I wondered what I would do if ________ with a real mid-air medical emergency --- without access ________ a hospital staff and the usual emergency equipment. So ________ the New England Journal of Medicine last week________a study about in-flight medical events, I read it with ________.
The study estimated that there are a(n) ________of thirty in-flight medical emergencies on U.S. flights every day. Most of them are not ________; fainting and dizziness are the most frequent complaints. ________13% of them --- roughly four a day --- are serious enough to ________ a pilot to change course. The most common of the serious emergencies ________ heart trouble, strokes, and difficult breathing.
Let’s face it: plane rides are ________. For starters, cabin pressures at high altitudes are set at roughly ________they would be if you lived at 5,000 to 8,000 feet above sea level. Most people can tolerate these pressures pretty ________, but passengers with heart disease ________experience chest pains as a result of the reduced amount of oxygen flowing through their blood. ________ common in-flight problem is deep venous thrombosis(静脉血栓) --- the so-called economy class syndrome. ________ happens, don’t panic. Things are getting better on the in-flight-emergency front. Thanks to more recent laws, flights with at ________one attendant are starting to install(安装) emergency medical equipment to treat heart attacks.

A．addressed B．called C．informed D．surveyed

A．affair B．condition C．incident D．disaster

A．soon B．long C．often D．many

A．provided B．treated C．identified D．faced

A．to B．for C．by D．through

A．before B．since C．while D．when

A．collected B．published C．discovered D．conducted

A．patience B．joy C．interest D．sorrow

A．average B．amount C．sum D．number

A．significant B．serious C．common D．heavy

A．For B．Or C．So D．But

A．inspire B．require C．engage D．command

A．contain B．show C．imply D．include

A．enjoyable B．stimulating C．stressful D．boring

A．who B．which C．what D．that

A．hard B．unwillingly C．happily D．easily

A．may B．ought to C．used to D．need

A．Any B．Another C．Other D．One

A．Wherever B．Whichever C．Whenever D．Whatever

A．least B．worst C．most D．Best