《国家电网公司输变电工程质量通病防治工作要求及技术措施》中规定，建筑物长度大于（）m

阅读理解。

     HAVE you ever thought of being able to fly around the world in a few hours though it is about 40,000

kilometers? Now, maybe you can. Last Saturday, the American X-43A airplane made its first flight. It

reached a speed of 8,000 kilometers an hour. This makes it the fastest plane in the world. X-43A is only

three to four meters long,but it's very heavy: it weights 1,270 kilos.

     HOW old cart an insect be? 400 million years! Last Wednesday, scientists found the world's oldest insect

fossil (化石) in Britain. The fossil shows that the body of the insect was as big as a piece of rice and had

wings (翅膀). In the past, people thought the earliest insect was 380 million years old.

    THERE will be a new "star" in the sky soon. China plans to send a satellite (卫星) into space by September

2009. It will stay in space for one year. It will go around the moon and take pictures. It must be very

expensive, right? That's for sure-1.4 billion yuan! 

    Yuan Longping, the father of hybrid rice (杂交水稻), won the World Food Prize on Monday. Yuan

developed the world's first popular and widely grown hybrid rice. Hybrid rice plants can make more rice

than the ones people grew before.

1.If the X-43A goes round the earth, it will take about ______ hours to finish the trip. [ ]

A.3

B.5

C.8

D.12

2.The newly-found insect fossil showed that the earliest insect was ______ years older than believed. [ ]

A.10 million

B.400 million

C.20 million

D.380 million

3.Which of the following about the new star is NOT true? [ ]

A.It will go into space by September 2008.

B.It will stay in space for twelve months.

C.It costs a lot.

D.It will go around the moon.

4.Yuan Longping won the World's Food Prize because he ______. [ ]

A.is the father of his children.

B.likes to eat hybrid rice.

C.developed the world's first popular and widely grown hybrid rice.

D.grows more rice than others.

5.The above paragraphs are taken from ______. [ ]

A.a story

B.an advertisement

C.an explaining writing

D.a newspaper

若a₁，a₂，…是等差数列，且a₇=4，则前13项之和S₁₃=______．

使心尖搏动向患侧移位的有（）

A．胸膜粘连

B．肺气肿

C．肺不张

D．胸腔积液

E．心包炎

西周时代，出现我国最早的医学分科，称骨科医生为（）.

GCr15属于（）。

A.合金结构钢

B.合金工具钢

C.特殊性能钢

D.普通结构钢