单选题Only eight out of China's 74 biggest cities passed the government's basic air quality standards in 2014, the environment ministry (A) has said.The most polluted (B) cities were in north- eastern Hebei.Beijing and Shanghai both failed the assessment, it (C) was based on measurements of major pollutants.China is attempting to cut pollution but (D) the country still relies heavily on coal for its energy needs.The government shut more than 8,000 coal-burning factories in Hebei last year.But the BBC's Celia Hatton in Beijing says like many places in China, the authorities are struggling to balance factory closures with the demands of the country' s slowing economy.
A．ministry
B．polluted
C．it
D．but
it-which。参考译文：环境部表示，2014年中国74所大城市中，只有8所城市通过了政府基本空气质量标准。污染最严重的地区为河北省东北部。此项评估基于主要污染物的测量，北京和上海都未能达标。
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1Questionsrefer to the following article.
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 place 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 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 cold, 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.Every year, when theseason of bad weather arrives, the lobsters get into a long time and start to walk across the floor ofthe 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.
The majority of animals migrate for__________.
A．place
B．safety
C．food
D．warmth
