店铺的外观设计必须遵循两个原则，这就是：让顾客确知店铺的存在和()。
The writer uses the example of his staying overnight in a familys home to
A. argue that American kids have many toys.
B. complain about kids being given too much by their parents.
C. illustrate the fact of overindulgence in America and its bad effects.
D. prove the difficulty of laying out his things due to an overabundance of toys.
By saying that "Once the sands have run out of a persons hourglass, they cannot be replaced"(Lines 3-4, Paragraph 2), the writer means that
A. the sands that cannot be replaced will disappear.
B. the past time cannot come back again.
C. the hourglass cannot save time for people.
D. people should not wear hourglass with sands.
The purpose of writing this text is probably to
A. praise the high technological level of Harvard Medical School.
B. comfort those patients who have developed coronary heart disease.
C. introduce a new therapy to cure heart disease.
D. criticize the traditional bypass surgery.
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