当射线波长一定时，下列哪种物质的（）μ最大。 A.Fe B.Al C.Ti D.Cu

The Internet is closely connected with our daily life. Can you _______ life without it?

A．understand

B．imagine

C．catch

D．expect

阅读下面的短文，并根据短文后的要求答题。（请注意问题后的字数要求）。

Many students find it hard to make friends when they are in high school. Keeping my suggestions in mind may give you a hand. They certainly helped me, and by the end of my three years of high school, I had formed my group of friends, with whom I still keep in touch now.

Here are my tips:

Say hello anytime I see an acquaintance（相识的人）.

Because I was always smiling and greeting the people I knew, people naturally thought I was friendly（though I am not naturally sociable）. And high school students want to be friends with sociable people.

Take the first step.

All the girls there already knew each other—they didn't need another friend. But I did, so I had to make the effort. I had to be the first one to invite somebody to go to a movie with me, or come to my house. Once I did that they started to respond with the same thing.

Use classes to get to know people.

I met most of my first friends because I sat next to them in class. Class（before, after, or even during class time）is a great opportunity to begin a conversation. For example, ask for help about homework.

Make friends slowly.

I couldn't get discouraged (泄气的) when it took a while to make friends．It really takes some time to make new friends. In a word, ________________________.

　Above all, remember that it can and will get better. You may have to work a little to make your high school experience a great one, but it's really worth it!

小题1:For what purpose does the writer write this passage?（Please answer within 15 words.）

____________________________________________________________________

小题2:Which sentence in the passage is the closest in meaning to the following one?

I was believed to be sociable because of my friendly attitude towards others．

_____________________________________________________________________

小题3:Fill in the blank with a sentence.（Please answer within 10 words.）  _____________________________________________________________________

小题4:Which piece of advice does the following sentence belong to? (Write in detail)

Everybody should make friends patiently in high school.　

____________________________________________________________________       

小题5:Translate the underlined sentence in the first paragraph into Chinese.　　  ___________________________________________________________________

下肢静脉频谱多普勒的时相变化代表了()

A．进行乏氏(Valsalva)动作时血流的变化

B．患者进行体位改变致血流变化

C．腓肠肌收缩时的血流变化

D．呼吸时的血流变化

E．探头频率改变时血流的变化

正常人口服葡萄糖后多长时间血浆胰岛素达到高峰（）

A.90分钟

B.120分钟

C.150分钟

D.30分钟

E.60分钟

199×年×月×日18时15分，某炼油厂油品分厂罐区发生爆炸，引起310号油罐燃烧，造成2人死亡，直接经济损失约39万元。
事故当日13时许，某炼油厂油品分厂半成品车间工人黄某某在当班期间，发现310号油罐油面高度已达14.21m，接近警戒高度14.30m，黄马上向该厂总调度进行了报告，并向总调度请示310号油罐汽抽调合量。根据总调度的指示，黄某某进入罐区将油切换至 304号油罐。13时30分许，黄在给310号油罐作汽油调合流程准备时，本应打开310号罐D400出口阀门，却误开了311号油罐D400出口阀门。15时许，黄开启11A号泵欲对 310号油罐进行自循环调合，由于错开了311号D400出口阀门，实际上此时310号油罐不是在自循环，而是将311号罐中的汽油抽人310号油罐。15时40分，仪表工陈某某从计算机显示屏上发现310号油罐油面不断上升，随后计算机开始“高位报警”，陈当即让黄到罐区去核实一下310号罐的油面高度，黄却误认为是计算机不准确，没去核实也未采取其他措施。16时，在交班时违反规定，没有在油罐现场进行交接班，也未核实油罐流程。17时50分，310号油罐的汽油开始外冒，部分汽油挥发，在空气中形成爆炸性混合气体。18时15分，某省洪泽县第二建筑公司工人吕某某驾驶手扶拖拉机路过罐区11号路时，排气管排出的火星遇空气中的爆炸混合气体发生起火爆炸，吕某某被当场烧死，当班工人被严重烧伤抢救无效死亡。310号油罐当即燃烧，17h后被扑灭。
对事故责任者的处理：
黄某某对工作不负责任，误开阀门，造成311号油罐汽油窜至310号油罐，当计算机报警后，黄掉以轻心，没有进行现场核实，致使310号罐油满外溢，并且违反现场交接班制度、双点巡回检查制度，以致没能及时发现和制止错误的流程。黄某某对这一特大火灾爆炸事故负有直接的责任。其行为触犯《刑法》第114条的规定，构成重大责任事故罪。
根据以上情形回答下列问题，1～4题为单选题，只有一个正确的答案。

这起事故的直接原因是( )。

A．黄某某对工作不负责任，误开阀门，致使310号罐油满外溢

B．罐区附近机动车排气管未加火星熄灭器

C．仪表工陈某某未亲自核实310号罐的油面高度

D．接班人员没有在油罐现场进行交接班，也未核实油罐流程

E．总调度油面高度数据显示不正确