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A.its success led to the great American canal boom in the 1830s
B.it ended just a few years later in a tremendous failure
C.it suffered from competition from railroads and trucks
D.it proved to be less profitable than its investors expected
答案:26A 27C 28D 29D 30D
Text 3
Pain will propel most people to a doctor’s office faster than just about any other complaint.It’s usually a sign that something is wrong--though it’s not always clear just what the problem is.Doctors can’t measure pain objectively the way they can measure blood pressure or cholesterol levels.So when pain doesn’t immediately respond to treatment, physicians and patients often--too often--accept it as just another symptom that has to be lived with.
Failure to meet the standards,which were jointly developed with the University of Wisconsin Medical School in Madison,could lead to a financially devastating loss of the right to treat Medicare and Medicaid patients.
A.most people find pain less tolerable than other physical discomforts
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