西部地区的人口约为（2002 年）：[] A．3．58亿 B．4．58亿 C．5

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    Don't worry if you have a problem! This is easy to say if you don't have one yourself, I know. But the only

people who don't have troubles are gathered in little neighborhoods. We call them cemeteries (坟墓).

    If you're breathing, you have difficulties. That's how life is. But believe it or not, most of your problems may

actually be good for you! Let me explain.

    Maybe you know about the Great Barrier Reef (大堡礁), running some 1800 miles from New Guinea

(新几内亚) to Australia. Tour guides often take visitors to see the reef. On one tour, the guide was asked an

interesting question. "I notice that the lagoon (泻湖) side of the reef looks pale (苍白) and lifeless, while the

ocean side is lively and colorful. Why is this?"

    The guide answered:"The coral (珊瑚) around the lagoon side is in still water. With no challenge to its survival

(生存), it dies early. The coral on the ocean side is always being tested by wind, waves and storms. It has to

fight for its survival every day. As it is challenged and tested, it changes and grows healthy, it grows strong." He

added, "That's the way it is with every living thing."

    That's how it is with people. Challenged and tested, we come alive! Like coral by the sea, we grow. Physical

problems make for a stronger body. Stress makes for a stronger mind.

    So, you have problems-no problem! Just tell yourself,"There I grow again!"

1. From the beginning of the passage we know _______. [ ]

A. we needn't worry about our problem

B. problems follow us for ever

C. it's natural to face all kinds of problems

D. above the all

2. Who has no problems according to the passage? [ ]

A. The persons who are very famous

B. The persons who are living in the cemeteries.

C. The persons who have been born

D. The persons who have much money.

3. In the writer's opinion, ________. [ ]

A. problems bring us much trouble

B. we should try to stay away from any trouble

C. problems have two sides, good or bad.

D. the fewer things we do, the less trouble we'll meet

4. The reason why lagoon side of the reef has no life is _______. [ ]

A. it hasn't got any sunlight

B. it never faces any challenge and tests

C. it has less energy than others

D. it has no work to do every day

5. After reading this passage, we should ________. [ ]

A. regard any problem as challenge

B. learn from the lagoon side

C. worry your problem

D. enter into cemeteries

某人在一次事故中整张脸被损，医生用了近15个小时给他换上了一张新脸，现其新脸已成活。从免疫角度分析，医生给他换上的新脸和换脸后的反应分别属于（   ）

A．抗原，特异性免疫

B．抗原，非特异性免疫

C．抗体，特异性免疫

D．抗体，非特异性免疫

主梁下挠与主梁水平旁弯同时存在，向内弯曲使小车轨距减小，而轨距减小到一定程度时，对于双轮缘小车将造成运行夹轨；对于外侧单轮缘小车，将造成脱轨的危险。

临床应用时应避免使用的配伍关系是（）

A.相须

B.相使

C.相杀

D.相畏

E.相反

《城镇燃气设施运行、维护和抢修安全技术规程》CJJ51－2006规定：对燃气管道设置的阴极保护系统应定期检测，检测周期及检测内容应符合下列规定：牺牲阳极阴极保护系统、外加电流阴极保护系统检测每年不少于（）次；电绝缘装置检测每年不少于（）次。

A.1、1

B.1、2

C.2、2

D.2、1