造成甲醇合成反应CO转化率低的因素有（）。A、循环量低 B、操作压力高 C、惰性气含

设全程误码率指标为10↑（-9），全程共有200个中继段，且各中继段误码率要求相等，则每个中继段的误码率为（）。

A.10-9

B.2×10-7

C.5×10-12

D.10-11

过敏性紫癜的治疗原则是（）

A.控制感染

B.输血

C.除去病因

D.止血

E.脱敏

阅读理解

      Looking back on my childhood,I am convinced that naturalists are born and not made.Although we

were all brought up in the same way,my brothers and sisters soon abandoned their pressed flowers and

insects.Unlike them,I had no ear for music and languages.I was not an early reader and I could not do

mental arithmetic.

      Before World War ? we spent our summer holidays in Hungary.I have only the dim memory of the

house we lived in,of my room and my toys.Nor do I recall clearly the large family of grandparents,aunts,

uncles and cousins who gathered next door.But I do have a clear memory of the dogs,the farm animals,the local birds,and above all,the insects.

      I am a naturalist,not a scientist.I have a strong love of the natural world and my enthusiasm led me into varied investigations.I love discussing my favorite topics and enjoy burning the midnight oil while reading

about other people's observations and discoveries.Then something happens that brings these observations

together in my conscious mind.

      Suddenly you fancy you see the answer to the riddle,because it all seems to fit together.This has

resulted in my publishing 300 papers and books,which some might honor with the title of scientific

research.

      But curiosity,a keen eye,a good memory and enjoyment of the animal and plant world do not make a

scientist:one of the outstanding and essential qualities required is selfdiscipline,a quality I lack.A scientist

requires not only selfdiscipline,but hard training,determination and a goal.A scientist,up to a certain point,

can be made.A naturalist is born.If you can combine the two,you get the best of both worlds.

1．The first paragraph tells us the author________.

A．was interested in flowers and insects in his childhood

B．lost his hearing when he was a child

C．didn't like his brothers and sisters

D．was born to a naturalist's family

2．The author can't remember his relatives clearly because________.

A．he didn't live very long with them

B．the family was extremely large

C．he was too young when he lived with them

D．he was fully occupied with observing nature

3．Which of the following statements is TRUE according to the passage?

A．The author is a naturalist,but not a scientist.

B．The author is a scientist as well as a naturalist.

C．The author is first of all a scientist.

D．The author is neither a naturalist nor a scientist.

4．The author says that he is a naturalist rather than a scientist probably because he thinks he________.

A．has a great deal of trouble doing mental arithmetic

B．lacks some of the qualities required of a scientist

C．just reads about other people's observations and discoveries

D．comes up with solutions in a most natural way

下列情形中，情节严重可构成非法经营罪的是（）。

A．未经国家有关部门批准，非法经营证券、期货或保险业务的

B．未给国家有关部门批准，擅自设立期货交易所、期货经纪公司的

C．以所经营的商品进行虚假宣传的

D．捏造并散布虚假事实，损害竞争对手商业信誉的

当空腹血糖低于多少为低血糖症（）。

A.1.8mmol／L

B.4.2mmol／L

C.3.9mmol／L

D.2.2mmol／L

E.2.8mmol／L