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【判断题】
吸烟是引起脑卒中最重要的独立危险因素。A.
正确
B.
错误
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举一反三
【单选题】Lung cancer， like some other cancers， often doesn‘t produce __________ until it is too late and has spread beyond the chest to the brain， liver or bones．
A.
trails
B.
therapies
C.
symptoms
D.
symbols
【单选题】As a promotional experiment, Omega Company distributed four million catalogs. In one of the two versions of the catalog, the description of each item for sale mentioned a 'Made by Hand' label. The num...
A.
Consumers receiving the catalog mentioning the label had previously purchased items from Omega Company by mail but consumers receiving the other catalog had not.
B.
Surveys showed that consumers returned purchased items to Omega Company during the promotional campaign at the same rate regardless of which catalog they received.
C.
The number of purchases from Omega Company declined substantially after the promotional campaign was completed .
D.
Omega Company mailed three times as many catalogs that did not mention the 'Made by Hand' label as catalogs that did mention the label.
E.
Omega Company sold twenty percent fewer items during the year of the promotional campaign than it had during the previous year.
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