更多"The United States is ______ the sou"的相关试题:
[单项选择]Why do lakes in the United States and Canada become dead lakes
A. Fish in the lakes die because acid rain deprives them of oxygen.
B. Fish in the lakes die from taking in poisonous substances released from the acids.
C. Fish in the lakes die from direct contact with accumulated acid in the water.
D. Air pollutants are dissolved in the water and thus kill the fish.
[单项选择]The United States and Canada have agreed ______ in regard to the Great Lakes.
A. to eliminate swimming entirely
B. to limit boating and
C. to limit phosphates and detergents
D. to kill all algae
[单项选择]The United States and Canada are lands of ______ except for the Indians, who are the only true natives.
[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]After 1850,various states in the United States began to pass compulsory school attendance laws.
A. harsh
B. diversified
C. mandatory
D. complicated
[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. types of vitamins
B. types of protein
C. types of minerals
D. amounts of energy, protein, vitamins, and minerals