水灰比小，混凝土强度就低。

乙肝病毒的两对半结果中，最具传染性的患者（）

A.HBsAg（-）抗HBs（-）HBeAg（-）抗HBe（-）抗HBc（-）

B.HBsAg（+）抗HBs（-）HBeAg（-）抗HBe（-）抗HBc（-）

C.HBsAg（+）抗HBs（-）HBeAg（-）抗HBe（+）抗HBc（+）

D.HBsAg（+）抗HBs（-）HBeAg（+）抗HBe（-）抗HBc（+）

E.HBsAg（-）抗HBs（-）HBeAg（-）抗HBe（-）抗HBc（+）

小胖去文具店买文具，他所带的钱，如果买9.8元的钢笔后，还能剩下5.2元．如果改买5.8元的水笔，他还能剩下多少钱？

2006年4月，共青团中央下发通知，要求各级团组织在5月集中开展“我与祖国共奋进──践行社会主义荣辱观志愿服务月”主题活动。某校901班团支部响应中央的号召，开展了以下活动。

活动一：“以服务人民为荣”──助老助残献爱心

活动二：“以遵纪守法为荣”──履行义务我先行

……

运用所学知识回答：

（1）志愿者通过“活动一”主要践行了哪些社会公德？

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（2）“活动二”要求我们自觉履行义务。请列举两条公民的基本义务。

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（3）对中学生开展志愿服务月活动，一些同学持反对意见。如果你是正方，请针对反方的下述观点，写一段简要的辩词。

反方：中学生的主要任务就是学习，搞志愿服务影响学业，不利于自身发展。

（友情提示：可选择一个角度论证自己的观点，如道德义务和法定义务的关系、履行道德义务的重要性、青少年的自身发展等。）

当可燃物混合气体达到爆炸极限上限时遇火（）。

A.会燃不会炸

B.不燃不炸

C.会燃会炸

Have you ever wondered whether writing and maintaining your business blog is a waste of time If you have, it probably is. Business blogs are valuable for some companies, but for many blogging takes up time and resources better spent elsewhere. If any of the following statements apply to you, stop posting to your blog (or re-purpose what you would have posted) and start doing something more productive:

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You dread writing another post.

Either way, whatever you publish will not represent your business well, so why do it Any time you feel you can’t put your best foot forward, don’t take the step.

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Your page views are stagnant.

Unless of course you can accurately identify tangible benefits from that readership.

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You can’t quantify your return.

Blogging is like any other investment in time and resources: If you don’t see a return, don’t do it.

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Your goal is to provide valuable resources to customers.

Potential customers who gladly read resource pages often run screaming from the same information when it appears on a blog.

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Your readers are not your customers.

Building an audience is useful only if the audience contains current and potential customers. Know who is reading your biog. If you can’t be bothered to find out, that’s yet another indication it’s time to stop.

[A] Many business owners say, "I don’t have any numbers to back it up, but I know my blog is paying off." Really How If your blog isn’t sending significant traffic to your website via search engines, isn’t directly generating sales, doesn’t create a community, or creates a community that doesn’t actually

benefit your business, your blog isn’t paying off.

[B] If you aren’t excited by the thought of sitting down to write your next post, you have nothing to say and will once again borrow ideas from another blog, or already realize blogging is a waste of time but won’t admit it.

[C] Great goal. By all means do it. But don’t put how-to information, or useful tips, or non-news information on your blog. Many people are blog-averse because most blogs are terrible, so your blog may automatically get painted with the same brush. If your material is relatively evergreen, create resource pages on your website instead.

[D] When new posts average the same number of page views, and on a monthly basis so does your entire blog, you’ve stalled. Maybe loyal readers keep returning, or maybe you gain some and lose some, but either way not much is happening. A blog with a small stagnant readership is a blog that is a waste of time, at least for business purposes.

[E] Never blog because you think it helps; you have to know. Knowing takes effort. If you’re not willing to put the time you need into tracking and analyzing data, you’re either lazy or afraid to find out you’re wasting your time on your blog. Sometimes quitting is more admirable than staying the course.

[F] This happens more often than you think. For example, a friend is an incredibly successful financial planner. He writes a blog that gets thousands of unique visitors a month. But he writes about topics of interest only to other financial planners. That would be fine if his blog generated media opportunities, or supported a book he plans to write, or helps him network and bring in more business—but it doesn’t.

44（）