[单项选择]Many studies have proven that eating at fast-food restaurants ______ per week is associated with more weight gain in otherwise healthy young adults.
A. twice more
B. as twice
C. twice more than
D. more than twice

[单项选择]Recent scientific studies have proven that ulcers are caused, at least in part, by the heliobacter bacterium. Dr. Redding has hypothesized that a natural way to prevent and cure ulcers is to eat large amounts of raw broccoli, which contains potent organic compounds that are beneficial to gastric health.（）
A. All of the following statements support Dr. Redding’s hypothesis, EXCEPT: It has been shown that people who consume raw broccoli on a regular basis have a 65 percent lower chance of developing ulcers than do the general population.
B. One of the organic compounds found in broccoli has been shown to have an antibiotic effect on the heliobacter bacterium.
C. Dr. Redding conducted a study in which groups of patients suffering from ulcers either ate large quantities of broccoli or ate a diet that included no vegetables; several of the patients who ate the large quantities of broccoli showed marked improvement in their conditions.
D. Broccoli is one of the most potent dietary sources of antioxidants, the organic compounds shown to combat the free radicals that are thought to cause cancer.
E. Test animals with chemically induced ulcers showed some signs of improvement when raw broccoli was incorporated into their diets.

[单项选择]Previous studies have indicated that eating chocolate increases the likelihood of getting heart disease. However, a new, more reliable study has indicated that eating chocolate does not increase the likelihood of getting heart disease. When the results of the new study become known, consumption of chocolate will undoubtedly increase.
Which of the following is an assumption on which the conclusion above is based
A. Most people who eat a great deal of chocolate will not get heart disease.
B. Although they believe that eating chocolate increases the likelihood of getting heart disease, some people still eat as much chocolate as they want.
C. People who have heard that eating chocolate increases the likelihood of getting heart disease do not believe it.
D. There are people who currently eat as much chocolate as they want because they have not heard that eating chocolate increases the likelihood of getting heart disease.
E. (E) There are people who currently limit their consumption of chocolate only because they believe that eating chocolate increases the likelihood of getting heart disease.

[填空题]Many studies have found human expressions are

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