在下列影响质量变异的因素中，（）属于偶然性因素。A．材料规格、型号均符合要求，但材质

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

注意缺陷多动障碍病儿的临床表现不包括（）

A.注意力缺陷

B.活动过度

C.任性冲动

D.情绪不稳

E.神经检查多异常，智商偏低

患者，男性，36岁，咳嗽3月余，偶有少许咳痰，痰中带血，无低热盗汗。查体：浅表淋巴结无肿大，肺部未见阳性体征。为明确诊断，该患者首选的检查为（）

A.全胸片

B.胸部CT

C.支气管镜检查

D.痰培养

E.痰脱落细胞学

普通货物运输经营者不得承运炸药、雷管、导火索、爆竹、烟花、礼花弹等常见爆炸性物品。