单项选择题

The phrase "set oneself apart" (Line 3, Par

A．2) means ______A. to reserve to a particular useB. to put to one sideC. to make noticeable or outstandingD. to determine to pursue
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单项选择题
Why do people of heart disease often feel uncomfortable while taking a flight
A．Because low pressure can cause the air in body cavities to expand.
B．Because medical devices implanted in their bodies expand.
C．Because they tend to sit too long in a cramped position.
D．Because the amount of oxygen flowing through their blood vessels is reduced and thus causing chest pains.
单项选择题
Doctors who came to passengers' aid used to get worried because ______
A．they were afraid of being taken to the court if the passengers they treated didn't recover
B．they were afraid of not being able to give those passengers proper treatment
C．flights in the past couldn't provide them with necessary medicines
D．they were usually nervous when attending to patients on flights
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