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（1）丙酸钠是一种常用的防腐剂，其化学式为C3H5O2Na。它由 种元素组成，碳元素和氧元素的质量比为 。
（2）生石灰是常用的干燥剂。请用化学方程式表示其作干燥剂的原因 。
（3）铁粉也可用作保鲜剂，它利用了铁生锈的原理，所以又称“双吸剂”。这里的“双吸”是吸收空气中的 。有一袋铁粉使用了一段时间，表面已经生锈，经验证它还可以继续使用，其验证方法是加入过量的稀盐酸，写出有关反应的化学方程式 、 。 查看习题详情和答案>>
Get SMART This Year
| interest however take monthly weight week start will they new |
If you’re one of 3 , you’ll be more successful if you make SMART goals! Each goal should be:
Specific. Don’t say you want to lose some 4 , read more or exercise. Decide how much weight to lose, how many books to read, or how many times a 5 to exercise.
Measurable(可衡量的). Weigh yourself daily, count the number of books you read 6 , and make notes of how many times you exercise each week.
Attainable(可达成的). Don’t set impossible goals. For example, don’t make promise to lose 10 kilograms in a week. Or if you have just 7 running, realize you won’t be running a long-distance race in a month.
Relevant(相关的). If you love history, you probably 8 read eight books a month about science. You won’t stick with it if the subject isn’t 9 .
Timely. Set deadlines. How long will you 10 to read a book?
A new year is about starting over--- so start now! 查看习题详情和答案>>
Som
etimes people call ours a “throwaway society”. That means that we’re always throwing away old things and buying new ones. Many times, you no longer need something, but someone else may just need to buy one. For example, if your baby doesn’t like his toy car any longer, why not give it to a nearly family who has a little kid? That’s one less plastic toy car that they need to buy. It’s also one less plastic toy that needs to be produced, packaged and shipped to the toy store.
Here are some other ways to help save resources (资源)for the society:
★Use the other side of the paper.
★Use rechargeable (可再充电的) batteries for your electric toys, MP3 players, cell phones, and cameras.
★ Choose reusable travel cups instead of disposable (一次性的) paper or plastic cups.
★Take your own cloth shopping bags when you go shopping.
★ Drink tap water instead of buying bottled water.
And there are some things you can exchange with your friends, for example, books, toys, even clothes. It's a way for everyone to get something new without spending any money and without throwing many things away.
【小题1】The und
erlined word "ours" in the passage refers to (指代) _______.
| A．our society | B．our old things |
| C．our life | D．our throwaway things |
| A．buy another new one | B．help toy business develop |
| C．make the family very thankful to us | D．help save resources for the society |
| A．We should buy things that can be reused in our daily life. |
| B．We can exchange some things with others for further use. |
| C．It's good for us to throw away old things and buy new ones. |
| D．We are supposed to give the things we no longer need to our neighbors. |
| A．Try to throw as few old things as we can. |
| B．Use as many disposable things as possible. |
| C．Drink bottled water even though there is tap water around. |
D．Buy everything we need instead of exchang ing them with others. |
阅读下面短文，用括号内所给动词的适当形式填空（必要时可加情态动词或助动词）。
Tom worked in the office of Mr Bates.
One day, when Tom got to the office, a letter【小题1】_________(wait) for him. He opened it.
“Dear Tom,” the letter said, “I【小题2】________(write) to thank you for your help. You【小题3】_________(help) me so much when I came to your office. Here’s a ticket for the big football match.”
Tom looked at the ticket. He could not believe that he had it. Everyone looked forward to【小题4】__________(watch) the match!
“ I must watch the match,” he though. “ I must. I【小题5】_______(expect) the big match for 4 year.”
Tom thought and though. He【小题6】________(not put) his heart into any work. Then at twelve o’clock he knew what 【小题7】__________(do).
He went out of the office and called his sister, Jean.
At one o’clock Mr Bates came up to him. “I have bad news for you, Tom. Your sister telephoned just now. Your mother【小题8】_______(send) to hospital a moment ago.”
“Thank you,” Tom said. “I will go to the hospital. I 【小题9】________(come) back as soon as possible.”
In fact, Tom 【小题10】_________(leave) the office quickly for the football ground. Tom’s ticket was a good one. He could stand near the front.
The next morning, when Tom got to the office, Mr Bates came up to him. “You’re fired(解雇), Tom.” Then he walked away angrily.
“But why?” Tom asked.
Then a girl said, “We saw the match on TV here yesterday! You were on TV! Tom, you had such a good ticket!”