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问题 单项选择题

直肠癌最主要的扩散途径是

A．直接浸润
B．淋巴转移
C．血行转移
D．种植转移

答案

参考答案：B

解析：[考点] 直肠癌的扩散
直肠癌经淋巴转移是主要的扩散途径。上段直肠癌向上沿直肠上动脉、肠系膜下动脉及腹主动脉周围淋巴结转移。下段直肠癌向上方和侧方转移为主。直肠癌种植转移机会较小。

单项选择题

One of the most convenient and cheapest ways to see America is by riding a Greyhound bus. This interstate bus system connects all major cities in the United States, (52) people with frequent and convenient service. The bus system even has an international service (53) makes connection with cities in Canada and Mexico.

Its network even extends to some of the smaller towns and out-of-the-way communities (54) the great interior of the country. Traveling by bus may (55) longer than flying by plane, but the terminals are located in the center of most cities and there is (56) to the downtown area. These buses are comfortable and air-conditioned. They are all equipped with toilets in the rear to (57) the convenience of the passengers, but there are some very severe (58) of conduct which are strictly enforced. On all buses (59) is forbidden and the consumption of alcoholic drinks is not allowed.

(60) bus travel may not be suited to everyone’s taste, it affords budget travelers the (61) to see America in comfort and safety and at a leisurely unhurried pace.

59().

A.smoking 

B.tosmoke 

C.smoke 

D.smoker
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判断题

纳税人欠缴的税款发生在纳税人以其财产设定抵押、质押或者纳税人的财产被留置之前的，税收应当先于抵押权、质押权、留置权执行。
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