为什么电压互感器二次回路要一点接地？

Like many lovers of books, Mary and her husband, Richard Goldman, seldom walked past a bookstore without stopping to look inside. They often talked of opening their own store one day.

When Mary was in hospital with heart trouble in 1989, they decided it was time to get serious. Richard, who worked for a business company, wanted to work for himself, and Mary needed to slow down from her  job.

They started by talking to bookstore owners and researching(调查) the industry. “We knew it had to be a specialty store because we couldn’t match the big chains dollar for dollar,” says Mary. One figure caught her attention: She’d read somewhere that roughly 20 percent of books sold were mysteries(推理小说), and many buyers spent more than $300 a year on books. She and Richard were themselves mystery readers.

On Halloween 1992, they opened the Mystery Lovers Bookshop and Café near their home. With three children in college, the couple could not spend all the family’s money to start a shop. To cover the whole  $ 100, 000 cost, they drew some of their savings, borrowed from relatives and from a bank.

The store broke even in its first year, with only $ 120,000 in sales. But Mary was always coming up with new ways to attract customers. The shop had a coffee bar and it offered gifts to mystery lovers and served dinners for book clubs that met in the store. She also invited dozens of writers to discuss their stories.

Today Mystery Lovers makes sales of about $ 420,000 a year. After paying taxes, business costs and the six part-time sales clerks, Richard and Mary together earn about $ 34,000.

“The job you love may not go hand in hand with a million-dollar income,” says Richard. “This has always been about an enjoyable life for ourselves, not about making a lot of money.”

小题1: After Mary got well from her illness they began _________.

A．to study industrial management (工业管理)

B．to buy and read more mystery books

C．to do market research on book business

D．to work harder to save money for the bookstore小题2: How did their bookstore do in the first year?

A．They had to borrow money to keep it going.

B．They made just enough to cover all the costs.

C．They succeeded in earning a lot of money.

D．They failed though they worked hard.小题3:According to Richard, the main purpose(目的) of running the bookstore is _________.

A．to pay for children’s education

B．to get to know more writers

C．to set up more bookstores

D．to do what they like to do

患者，男性，45岁。因胆囊结石行腹腔镜胆囊切除术，术后3天进食半流质，第4天突然出现全腹疼痛、恶心、低热，白细胞数升高。X线腹平片显示肠梗阻征象。

该病人的可能处理的最直接一项是（）

A.生命体征监测

B.剖腹探查

C.腹腔置管引流

D.胃肠减压

E.抗感染治疗

达州盛产天然气，有“中国气都”之称的美誉．天然气的主要成分是甲烷（CH₄），我校化学兴趣小组的同学对甲烷燃烧的产物产生了兴趣，请你参与：

【提出问题】：甲烷燃烧后生成哪些物质？

【查阅资料】：含碳元素的物质完全燃烧生成CO₂，不完全燃烧生成CO；无水CuSO₄遇水变蓝．

【猜想与假设】：甲CO₂H₂O；乙COH₂O；丙NH₃CO₂H₂O；丁CO₂COH₂O．

你认为______同学的猜想是错误的，理由是______．

【实验探究】：为了验证上述猜想与假设，将甲烷在一定量的O₂中燃烧的产物依次通过如图所示装置：

（1）A、B装置的顺序能否颠倒？（填“能“或“否”）______．

（2）实验中用纯净O₂而不用空气的原因是______．

（3）实验中观察到A中无水CuSO₄变蓝，B、D中澄清石灰水变浑浊，C中红色粉末变成黑色，由此推断______同学猜想成立．

（4）请写出B中澄清石灰水变浑浊、C中红色粉末变成黑色的化学方程式：______、______．

【反思与交流】：为避免有毒的CO污染环境，所以含碳元素的物质燃烧必须满足的条件是______．

翻译句子。

小题1:今天下午和我一起购物怎么样？

________ _______ ______ shopping with this afternoon.

小题2:学习英语真有趣。

It is______ ______ to learn English.

小题3:由于生病了，他没有去上学。

He didn’t go to school _____ _____ his illness.

小题4:他被邀请来这个电视剧中扮演一个角色。

He was invited to _______ _______ _______ in this TV play.

小题5:不要编造谎言，那是毫无意义的。

__________________any lies. That’s _____________.

小题6:你能起到什么样的作用？由你自己决定。

What role do you play? _________________________

小题7:不是每个人都喜爱看足球赛。

____________________________________________

小题8:如果你对待工作不认真，你就不可能干得好。

____________________________________________

性二型现象