[单项选择]Elementary schools in the United states provide formal education __________ arithmetic, science, social science, and communication skills that including reading, writing, spelling, and speaking.
A. ( such subjects as basic in
B. ( as basic subjects in such
C. ( in such basic subjects as
D. ( as in such basic subjects

[单项选择]Teachers of elementary schools are giving more weight to nurturing a student's talent in China.
A. exaggerating
B. confining
C. probing
D. developing

[单项选择]How many states are there in the United States


A. Thirteen.
B. Fifty.
C. Fifty one.
D. Sixty.

[单项选择]The United States is composed of fifty states, two of ______ are separated from the others by land or water.
A. them
B. that
C. which
D. those

[单项选择]The United States bought Louisiana from


A. France
B. Spain
C. Britain
D. Mexico

[单项选择]

The United States government publishes guidelines for appropriate nutrient intakes These are known as the Recommended Dietary Allowances (RDAs) and are updated regularly based on new research in the science of nutrition. RDAs are suggested amounts of calories, protein, and some minerals and vitamins for an adequate diet. For other dietary substances, specific goals must await further research. However, for the U.S. population as a whole, increasing starch and fiber in our diets and reducing calories (primarily from fats, sugar, and alcohol) is sensible. These suggestions are especially appropriate for people who have other factors for chronic diseases such as family history of obesity, premature heart disease, diabetes, high blood pressure, and high blood cholesterol, or for those who use tobacco. Snacks can furnish about one-fourth of the calorie requirements among teenagers Those snacks should also furnish much of the day's allowances for protein, minerals, and vitamins. Sa
A. protein
B. fats
C. starch and fiber
D. sandwiches

[单项选择]The United States is composed of 50 states , two of which are separated from ______ by land or water.
A. others
B. other one
C. the others
D. another

[单项选择]The United States (is composed of) fifty states, (two of those) are (separated) from the (others) by land or water.
A. is composed of
B. two of those
C. separated
D. others