下列农作物中不属于禾本科植物的是（）。A、玉米 B、小麦 C、水稻 D、花生

阅读以下材料，按照要求作文。

最新数据显示，以微博、微信、人人等为代表的移动社交工具与广大手机用户的生活已经密不可分，“今天你‘微’了吗”已经成为许多人每天见面的问候语。工信部统计数据表明，截至2012年9月，全国移动电话用户数达到10.8亿，其中3G用户已经达到2.026亿。许多省市手机上网普及率已经超过80%，每户户均流量已达每月150M……

有人认为我们就这样被手机“绑架”了，也有人说用手机进行社交更便捷了，也有人认为凡事要有度……

以上材料，一定引发你很多思考，请选取一个角度，自拟题目，写一篇不少于800字的文章(不要写成诗歌)。

品德是个体依据一定的社会道德行为规范行动时表现出来的心理特征和倾向，它是 ( )

A．比较不稳定的

B．受先天因素制约的

C．时稳时变的

D．比较稳定的

The smell of fresh air is becoming something of a distant memory, thanks to our increasing use of fragrance (香气). From air fresheners to scented (有香味的) candles, we live in a world of scent.

Recent figures show seven in ten people use air fresheners or scented candles to keep our homes smelling sweet. Yet recent records suggest that perfumed products could affect our health, causing problems including allergies (过敏), headaches and asthma (哮喘) .

One leading expert believes nearly a third of people suffer health effects from being exposed to scents. A major problem is so-called “contact” allergy—where perfumes and scented products cause eczema (湿疹) when they come into contact with the skin. About one in 20 is thought to be affected by fragrance allergy.

“Often it may not be immediately obvious that you have developed a fragrance allergy,” says Dr. Baron. “You don’t react immediately. Gradually, as you are exposed more and more, the body increases its reaction, until it becomes noticeable to you.”

People with pre-existing eczema are particularly vulnerable (易受影响). “The eczema worsens in areas in contact with perfumes,” says Dr. Baron. “But even those without allergies can be at risk of fragrance allergy.” You can become suddenly allergic to perfumes and personal care products that you have been using for years. “Even if you know which fragrance causes a problem, it can be difficult to avoid, as most personal care products –soap, shampoo, sun cream and washing powder—contain fragrances,” says Dr. Baron.

And strong scents can also cause headaches. Fragrances activate the nose’s nerve cells, stimulating the nerve system associated with head pain. To minimize risk, sufferers are advised to minimize the contact.

“Fragrance suggest cleanliness – yet people are smelling a potentially dangerous chemical mixture,” says Anne Steinemann, professor of the University of Washington. “We often use them to mask one problem – as with air fresheners – but create a greater one – adding poisonous chemicals to the air.”

小题1:What is the text mainly about?

A．The world trend of using fragrance.

B．The benefits of using non-fragranced products.

C．The health problems caused by fragrance

D．The ways of removing allergy.小题2:According to Dr. Baron,            .

A．our bodies have an immediate reaction to fragrance.

B．seven in ten have suffered fragrance allergy.

C．fragrance can affect people who don’t have allergy

D．people can avoid contacting with fragrance easily小题3:Which of the following questions does the text NOT answer?

A．Which products contain fragrance?

B．What’s the influence of fragrance in the air?

C．What are the air fresheners made up of?

D．How are headaches caused by fragrance?小题4:The following paragraph might discuss            .

A．the asthma caused by strong scents.

B．people’s efforts to protect fresh air.

C．the methods of curing eczema

D．the bad effects of air fresheners.

物体在合外力作用下做直线运动的v－t图象如图所示．下列表述错误的是

A．在0～2 s内，合外力做正功

B．在0～7 s内，合外力总是做功

C．在2～3 s内，合外力不做功                          

D．在4～7 s内，合外力做负功

试题图2-1中（）所示机床的类代号为B。

A.A

B.B

C.C

D.D