题目内容
It’s said that ______of the water around the world___ polluted.
A. two third , has B. two thirds, have
C. two third, are D. two thirds, is
D
【解析】
试题分析：句意：据说世界上的三分之二的水被污染了。在英语中分子用基数词表达，分母用序数词表达如果分子大于1，分母变复数。三分之二，two thirds。分数，作主语时，根据其后接的词而定，如果为不可数名词，则相当于单数，如果其后接的为可数名词复数形式，则相当于复数，根据句意及结构，故选D
考点：考查分数的用法。
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 easily, but others move to get away from places that are too crowed.
When cold weather comes, many birds move to warmer places to find food. Some fish give birth in warm water and move to cold water to feed. The most famous migration(迁移) of the fish, which is called “salmon(大马哈)”. 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 crowed. 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 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 others times we don’t. Maybe living things just like to travel.
Migrations | |
Some birds | 1._______ when cold weather comes |
Some fish | Give birth in2.______and move to ______ to feed |
A kind of mouse | 3.________ when they become too crowed. |
4._________ | Walk across the floor of the ocean when the season of 5. _______ |