问题 选择题

下列关于铜的说法正确的是

A.铜在干燥的空气中和在潮湿的空气中存在的形态相同

B.相同质量的铜分别与足量的氯气、硫完全反应,失去的电子数相同

C.相同物质的量的浓硫酸分别与足量的铜和氧化铜反应,生成硫酸铜的量相同

D.相同质量的铜分别与足量的稀硝酸、浓硝酸完全反应,生成气体的物质的量不同

答案

答案:D

正确答案D

A.不正确,铜在干燥的空气不易变质,在潮湿的空气中产生铜绿。

B.不正确,相同质量的铜分别与足量的氯气、硫完全反应,失去的电子数不相同,为2:1,Cu+Cl2=CuCl2,但2Cu+S=Cu2S

C.不正确,相同物质的量的浓硫酸分别与足量的铜和氧化铜反应,生成硫酸铜的量不相同,Cu与浓H2SO4反应会生成SO2,S原子不能全部转化为CuSO4.

单项选择题
阅读理解

What is Home stay? Literally it is a home for you to stay at when you are not at home. To be specific, home stay provides foreign language students with the opportunity to speak native language outside the classroom and the experience of being part of a British home. Here is what you will experience in our British Home-stay Program.

What to Expect

The host will provide accommodation and meals. Rooms will be cleaned and bedcovers changed at least once a week. You will be given the house key and the host is there to offer help and advice as well as to take an interest in your physical and mental health.

Accommodation Zones

Homestays are located in London mainly in Zones 2, 3 and of the transport system. Most hosts do not live in the town centre (Zone 1) as much of central London is commercial and not residential(居住的). Zones 3 and 4 often offer smaller accommodation in a more crowded area. It is very convenient to travel in London by underground.

Meal Plans Available

• Continental Breakfast

• Breakfast and Dinner

• Breakfast, Packed Lunch and Dinner

It’s important to note that few English families still provide a traditional cooked breakfast. Your accommodation includes Continental Breakfast which normally consists of fruit juice, cereal(谷物类食品), bread and tea or coffee. Cheese, fruit and cold meat are not normally part of a Continental Breakfast in England. Dinners usually consist of meat or fish with vegetables followed by desert, fruit and coffee.

Friends

If you wish to invite a friend over to visit, you must first ask your host’s permission. You have no right to entertain friends in a family home as some families feel it is an invasion of their privacy.

Self-Catering Accommodation in Private Homes

Accommodation on a room-only basis includes shared kitchen and bathroom facilities and often a main living room. This kind of accommodation offers an independent lifestyle and is more suitable for the long-stay student. However, it does not provide the same family atmosphere as an ordinary homestay and may not benefit those who need to practise English at home quite as much.

小题1:The passage is probably written for _____.

A.host willing to receive foreign students

B.foreigners hoping to build British culture

C.travellers planning to visit families in London

D.English learners applying to like in English homes小题2: Which of the following will the host provide?

A.Medical care.

B.Room cleaning.

C.Free transport.

D.Physical training.小题3: What can be inferred from Paragraph 3?

A.Zone 3 is more crowded than Zone 2.

B.The business centre of London is in Zone 2.

C.Hosts dislike travelling to the city centre.

D.Zone 1 offers bigger accommodation.小题4: According to the passage, what does Continental Breakfast include?

A.Dessert and coffee.

B.Fruit and vegetables.

C.Bread and fruit juice.

D.Centre and cold meat.