问题 推断题

A、B、C、D、E分别是甲烷、氢气、氧气、氧化铜和水中的一种物质.通常情况下D为固体。下图用圆和方框表示这五种物质,用两圆相切表示两种物质可以发生化学反应.用“→”表示一种物质能转化为另一种物质.请回答下列问题:

(1)在图中标出五种物质的化学式;                          

(2)B与C反应的化学方程式为                                  

(3)C与D反应的实验现象为                          

答案

)(1)A是甲烷;B是氧气;C为氢气;D为氧化铜;E是水。

(2)2H2+O22H2O;

(3)黑色固体逐渐变为(光亮的)紫红色,(管壁或容器壁)出现小水珠(或水雾或水滴)

题目分析:通常情况下D为固体,那么D为氧化铜;氧化铜只能与酸或还原性气体反应,那么E是水;甲烷燃烧生成水,那么A是甲烷;甲烷只能和氧气反应,那么B是氧气;剩余C为氢气。

单项选择题
阅读理解

阅读理解。

     Most people go to a doctor in their own town or suburb. But people in the Australian outback can't get to

a doctor quickly. The nearest doctor is sometimes hundreds of kilometers away so they have to call him on

a two-way radio. This special doctor is called the "flying doctor". He visits sick people by plane.

     When someone is sick, the doctor has to fly to the person's home. His plane lands on a flat piece of ground

near the person's house. Sometimes has to take the patients to hospital. Flying doctors take about 8,600 people

to hospital each year.

     However, most of time the person isn't very sick, and the doctor doesn't have to visit. He can give advice

on the radio from the office at the flying center. He can tell the patient to use some medicine from a special

medicine chest (箱子). There is one of these chests in every home in the outback. Each bottle, tube and packet

in the chest has a number. The doctor often says something like this, "Take two tables from bottle 5 every

four hours."

1. Some people in the Australian outback can't get to a doctor quickly, because _____. [ ]

A. There are few doctors there.

B. The nearest doctor is sometimes very far away from them.

C. There is always heavy traffic on the road.

D. They don't want to see a doctor.

2. The doctor there usually goes to visit his patient _____. [ ]

A. by sea

B. by air

C. on foot

D. in a car

3. From the passage we know that _____. [ ]

A. people in Australia are seldom ill

B. every family in the outback has a special medicine chest

C. a "flying doctor" is a man who flies people to hospital

D. these are very few hospitals in Australia