土地承包经营权自（）时设立。A、村委会通过  B、政府部门批准  C、土地承包经营权

Congress makes the laws in the United States. It has two pans, which are more or less equal in power. They are known as the House of Representatives and the Senate. The House of Representatives is larger than the Senate whose 100 members (two from each state) serve for six years. The 435 members of the House are elected every two years, and the number from each state is determined by the population of the state. For example, California, which has a large population, has 43 representatives, while the State of Nevada has only one.

The House and Senate are divided into small groups which take care of special matters such as education or foreign affairs. The most important work of Congress is often done in these groups, which are called subcommittees.

According to the Constitution of the United States, a senator must be at least 30 years old and he must have been a citizen of the United States for nine years at the time of his election. To be elected to the House a person must be 25 years old and must have been a United States citizen for seven years. At the present time, members of Congress include businessmen, farmers, teachers, and especially lawyers. In general, senators are better known than representatives because they are fewer in number and serve for a longer time. Many American presidents served in Congress before they became president.

The members of the Senate are elected for()years.

A. two

B. three

C. four

D. six

残胃癌多发生在离第一次手术

A．10～15年

B．5～lO年

C．＜5年

D．15～20年

E．20～25年

下列各地中，每年两次受到太阳直射的是

A．20°N，30°E

B．25°N，25°W

C．23.5°S，60°N

D．40°S，120°W

龋病病因的四联因素是（）

A.细菌、菌斑、宿主和食物因素

B.细菌、宿主、食物和时间因素

C.菌斑、宿主、牙排列拥挤和时间因素

D.蔗糖、细菌、宿主和遗传因素

E.菌斑、唾液分泌、营养和时间因素

在一个多法人联合体的企业集团中，公司治理的边界要（）公司的法人边界。

A.小于

B.等于

C.大于

D.没关系