[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 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 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]Generally hosts in the United States do not offer food more than once or twice because they _________.

[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 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 bought Louisiana from
A. France
B. Spain
C. Britain
D. Mexico

[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

[单项选择]The United States Declaration of Independence was drafted and signed in

[单项选择]The United States Congress appropriates some four million dollars_______ the upkeep of the White House grounds.
A. ( year for a
B. ( for a year
C. ( a year for
D. ( a for year

[单项选择]One of the fifty states in the United States___ an island, Hawaii.
A. is
B. are
C. was
D. were

[单项选择]The United States is composed of ______states and one district, the District of Columbia.
A. 50
B. 51
C. 48
D. 49

[单项选择]

Relations between the United States and Colombia suffered for many years because of an incident involving the Republic of Panama. By the en& of the Spanish-American War, Americans felt that an easier and faster: way was needed to ,get ships, from the Atlantic Ocean to the Pacific Ocean. Some people in the United States first believed that a canal across Nicaragua was the answer. However, President Theodore Roosevelt decided that a canal through Panama would be a better choice, In order to build the canal, the United States had to negotiate a treaty with Colombia, which at that time controlled Panama. Roosevelt offered Colombia, $10 million plus $ 250,000 a year for 99 years for a six-miles-wide strip of land across Panama. Colombia rejected the United States’offer. This angered President Roosevelt, and negotiations with Colombia, ended. In 1903，a revolution broke out in Panama. United States ships were sent by President: Roosevelt to protect the Panamanian revolutionari
A. develop trade relations with Europe
B. improve relations with South American countries
C. prevent European ships from reaching the Pacific Ocean
D. reduce travel time for its ships in case of war