一物体在沿粗糙的斜面匀速下滑的过程中[ ] A．物体的动能转化为重力势能 B．物

行大规模的牙周疾病流行病学调查

A．个人简化口腔卫生指数
B．牙龈指数
C．菌斑指数
D．龈沟出血指数
E．社区牙周指数

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 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 lobsters get into a long time 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 to travel.

小题1:Most animals move from one place to another at a certain time to _________.

A．give birth

B．enjoy warmer water

C．find food more easily

D．find beautiful places小题2:The mice in northern Europe move when _________.

A．they give birth

B．the weather is bad

C．the place gets too crowded

D．they haven’t enough food小题3:The lobsters move _________.

A．to the fresh water

B．to the deeper sea

C．at a certain time

D．to find more food

脊髓休克期（）

A.自律性膀胱

B.无张力性膀胱

C.无抑制性膀胱

D.反射性膀胱

E.排尿正常

建设项目( )是办理交付使用资产的依据，也是竣工验收报告的重要组成部分。

A．投资估算

B．竣工决算

C．检验验收

D．结清单报告