属五行之"火"的音是A．宫音 B．角音 C．商音 D．徵音 E．羽音

已知甲酸钠(HCOONa)溶液呈碱性．室温下用c(H^＋)相同、体积相同的盐酸与甲酸(HCOOH)溶液分别进行如下实验，相关叙述正确的是  [ ]

A．加水稀释，两溶液中的氢离子数目都不变

B．用等浓度NaOH溶液中和，盐酸比甲酸消耗的碱液少

C．跟等质量铝粉反应，盐酸比甲酸的起始反应速率快

D．跟过量的锌粒反应，盐酸比甲酸产生氢气的量多

阅读理解。

     We know that many animals do not stay in one place. Birds, fish and other animals move from one

place to another at a certain time. They move for different reasons: most of them move to find food more

easily, but others move to get away from places that are too crowded.

     When cold weather comes, many birds move to warmer places to find food. Some fishes give birth

in warm water and move to cold water to feed. The most famous migration(迁移) is probably the

migration of the fish, which is called "salmon". This fish is born in fresh water but it travels many miles to

salt water. There it spends its life. When it is old, it returns to its birthplace in fresh water. Then it gives

birth and dies there. In northern Europe, there is a kind of mouse. They leave their mountain homes when

they become too crowded. They move down to the low land. Sometimes they move all the way to the

seaside, and many of them are killed when they fall into the sea.

     Recently, scientists have studied the migration of a kind of lobster(龙虾). Every year, when the

season of bad weather arrives, the lobster get into a long line and start to walk across the floor of the

ocean. Nobody knows why they do this, and nobody knows where they go.

     So, sometimes we know why humans and animals move from one place to another, but at other

times we don't. Maybe living things just like travel.

1. Most animals move from one place to another at a certain time to _____.

A.  find food more easily                    

B. enjoy warmer weather

C. give birth                          

D. find beautiful places

2. The mice in northern Europe move when _____.  

A. they need fresh water            

B. the weather is bad

C. the place gets too crowded          

D. they haven't enough food

3. This passage is mainly about _____.    

A. why animals move from one place to another

B. how animals can find food easily

C. new discoveries of animals traveling

D. some problems with traveling 

液体物料只能采用泵输送。

纳米乳可以自发（经轻度振摇）形成。（）

车辆燃油报警灯亮，原因可能是燃油箱储油量不足。