检查（）时应先检查高压气管接头是否牢固、可靠，并站在侧方位。A.空压机 B.收尘器

I’m not so sure I like my friends any more. I used to like them-to be honest. We’d have lunch, talk on the phone or exchange emails, and they all seemed normal enough. But then came Face Book, and I was introduced to a sad fact: many of my friends have dark sides that they had kept from me.

Today my friends show off the more unpleasant aspects of their personalities via FaceBook. No longer hidden, they’re thrown in my face like TV commercials -unavoidable and endless advertisements for the worst of their personalities.

Take Fred. If you were to have lunch with him, you’d find him warm, and self-effacing（谦逊的）.Read his FaceBook and you’ll realize he’s an unbearable, food-obsessed boring man. He’d pause to have a cup of coffee on his way to save a drowning man-and then write about it.

Take Andy. You won’t find a smarter CEO anywhere, but now he’s a CEO without a company to run. So he plays Mafia Wars on FaceBook. He’s doing well-level 731. Thanks to FaceBook, I know he’s playing about 18 hours a day. Andy, you’ve run four companies-and this is how you spend your downtime? What happned to golf?What happened to getting another job?

Take Liz. She is positive that the flu vaccine will kill us all and that we should avoid it. And then comes Chris who likes to post at least 20 times a day on every website he can find, so I get to read his thoughts twice, once on FaceBook and once on Twitter.

In real life, I don’t see these sides of people. Face to face, my friends show me their best. They’re nice, smart people. But face to FaceBook, my friends is like a blind date which goes horribly wrong.

I’m left with a dilemma. Who is my real friend?Is it the Liz I have lunch with or the anti-vaccine madman on FaceBook? Is it the Fred I can grab a sandwich with or the Fred who weeps if he’s at a party and the wine isn’t up to his standard?

小题1: Who is opposed to the flu vaccine in the text?

A．Fred

B．Andy

C．Liz

D．Chris小题2:What’s Andy probably busy in doing now?

A．He’s running his company

B．He’s playing golf all day

C．He’s looking for another job

D．He’s playing computer games小题3:According to the text, FaceBook tends to _______.

A．present another side of people

B．offer some foods for free

C．show endless advertisements

D．get you to more parties小题4:The text is developed mainly by _____.

A．giving examples

B．following the time order

C．listing figures

D．raising questions

能分泌甲胎蛋白的肿瘤通常是（）

A.肺癌

B.前列腺癌

C.胰腺癌

D.肝细胞性肝癌

E.肾腺癌

挥发油中的芳香族化合物主要是（）

A.苯醌类化合物

B.萘醌类化合物

C.苯丙素类化合物

D.黄酮类化合物

E.木脂素类化合物

无纺布

我国标准规定工频安全电压有效值的限值为（）V。

A.30V

B.40V

C.50V

D.60V