问题 单项选择题 A1/A2型题

原发性肝细胞癌最敏感的肿瘤标志是()。

A.肝脏B超

B.肝CT

C.AFP

D.AP

E.γ-GT

答案

参考答案:C

解析:AFP是原发性肝细胞肝癌的最灵敏、最特异的肿瘤标志。除AFP阴性肝癌外,若AFP小于20μg/L,原发性肝癌基本不可能;AFP在100~300μg/L之间者必须进行随访,密切观察AFP的动态变化,注意可能的小肝癌AFP在350~500μg/L,或含量明显增高者,必须参考其他检查,应高度警惕原发性肝癌的可能;AFP为500~1000μg/L,且含量在短期内不断升高,原发性肝癌可能性很大,建议活检;AFP大于1000μg/L者,甚至在近期内AFP含量迅速升高,则原发性肝癌诊断基本可确定。

单项选择题
阅读理解

阅读理解。

     Car sharing is another way to drive green which is gaining in popularity, especially in urban areas.

People who may not drive every day but still want a car to run errands (差事) or drive on weekends

benefit most from car sharing. Car sharing is usually run by a service like Zipcar, though there are

nonprofit (非营利的) and informal car sharing services. Members pay a monthly fee and have access to

an entire fleet (队)of cars when they need one. The cars are parked in fixed spots around the city, so

members only need to make a reservation (预订), and then go to the pickup spot.

     Car sharing has major environmental benefits because it reduces the number of cars on the road.

Members don't drive just because they are in a car. They plan trips, and if they don't need a car, they

don't use one. Still, a car is available to them if they need to make a big trip to the grocery store, pick

someone up at the airport or if they want to go to the beach for the day. Members also benefit by having

access to a car without any of the headaches of ownership. They usually don't have to pay for the gas,

insurance or maintenance (保养), and the monthly membership fee is less than a typical car payment. So

if you really want to go green but aren't ready to totally give up a car yet, car sharing may be the way to

go.

     If you still need to get around, but want to go even greener than sharing a car, share a bus!

1. The author intends to tell us that car sharing         .

A. has become the most popular way to go to work

B. has become the best way to cut living costs

C. is becoming more and more popular in cities

D. is becoming popular both in urban and rural areas

2. We can learn from the passage that         

A. Zipcar can't help you if you are running urgent errands

B. Zipcar, different from other services, is aimed at green driving with no profit

C. Zipcar is a company supplying car sharing services for a monthly payment

D. Zipcar is a company providing formal car sharing free

3. The second paragraph mainly tells us           .

A. why people will share a car

B. why car sharing benefits the environment

C. why car sharing is cheaper than owning a car

D. why a car is available to members

4.Which of the following is NOT mentioned in the passage?

A. Car sharing has become a new trend (趋势).

B. Car sharing can save you the headaches of ownership.

C. Bus sharing is even greener than car sharing.

D. Zipcar is the largest company offering car sharing services.