更多"Why do lakes in the United States a"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]Why do children in the United States look forward to Christmas
A. Because they can eat turkeys.
B. Because they can wear new clothes.
C. Because they have a good holiday.
D. Because they can receive gifts and send cards.
[单项选择]Why do a lot of people in the United States call for censorship
A. Because they believe that they arch’t protected by the First Amendment.
B. Because they believe it is illegal to burn the U. S. flag.
C. Because they believe some people are taking advantage of the First Amendment.
D. Because they believe that artists should do a better job.
[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.
A. emigrants
B. dwellers
C. inhabitants
D. immigrants
[单项选择]Why was hemp banned in the United States
A. Because it can produce marijuana.
B. Because it is poisonous.
C. Because it is related to the marijuana plant.
D. Because it is harmful to human body.
[单项选择]Why was the United States called a "melting pot"
A. Most immigrants have settled in big cities.
B. Its population consists of people from various countries.
C. Most people tend to forget where their ancestors came from.
D. People gathered in racial groups.
[单项选择]Generally hosts in the United States do not offer food more than once or twice because they _________.
[单项选择]The United States is ______ the south of Canada and to the east of Japan.
A. to
B. on
C. in
D. at
[单项选择]How many states are there in the United States
A. Thirteen.
B. Fifty.
C. Fifty one.
D. Sixty.