There are many reasons why food fads have

题目：

There are many reasons why food fads have continued to flourish. Garlic has long been touted (兜售) as an essential ingredient of physical prowess (能力) and as a flu (1) , squash has been thought by some to cure digestive disorders, and red pepper has been (2) to promote endurance. The natural human desire for a simple solution to a difficult problem (3) the stage for promoting miraculous potions (饮剂), pills and combination of chemicals. The (4) individuals who eagerly embrace any second-hand information with scientific overtones (暗示) provide the foundation for healthy business enterprises.

A person who has never crossed the (5) of a health food store may be astonished, (6) or overjoyed. Countless elixirs (万应灵), herbs, powders and other fascinating extracts are only a (7) of the high-profit selection. The available literature includes pamphlets extolling (赞扬) the amazing return of youth one can (8) while drinking a potion filled with tropical weeds, as well as volumes (9) the reader of an almost (10) longevity.

The store is directly keyed to arouse visitors’ (11) over their health and to (12) on real and imagined problems by offering solutions that, (13) , cost more than the customers may be able to (14) Health food store patrons are often cajoled (劝诱) into buying tonics (补药) that promise to make the functioning of healthy organs even better, (15) whether an improvement is (16) for. Promotion of expensive products that consumers do not actually need takes (17) initiative and insight. (18) occasion, there may even be some slight (19) for truth in an entrepreneur’s (20) to cure customer of ills—for a price.

17（）

A.optimum

B.optional

C.considerable

D.considerate