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More and more birds are flying to settle in Qinghai Lake, one of the highest inland lakes in China, thanks to the protection efforts of the local government. Covering an area of over 4,000 square kilometers, Qinghai Lake is also the country's biggest salt lake.

Located in Qinghai Province of Northwest China, the lake is famous for the two islands at its northwest point—Cormorant Island and Egg Island. The two islands have plenty of floating grass and various fish, offering rich food sources to birds. The islands have become a paradise for different kinds of groups of birds and have been called “Bird Islands”£®

Each March and April, when ice and snow covering the Qinghai­Tibet Plateau (¸ßÔ­) start to melt, over 20 kinds of birds fly to the Bird Islands to lay eggs. During the months, flocks of birds cover the whole sky over the islands and bird eggs can be found everywhere. Visitors can hear the singing of birds from miles away. These have become a world­famous symbol of the lake.

To protect this paradise for birds and support calls for ecological protection, China set up the Qinghai Lake National Natural Reserve at the end of 1997. Meanwhile, the State has pointed out that the Bird Islands and Spring Bay of Qinghai Lake were central reserves.

Inspectors and conservators often patrol (ѲÂß) the lake, enriching local residents' knowledge of related laws and spreading knowledge about animal protection to visitors. They are making great efforts to call on people to love and protect the birds. At the same time, they have built special fences around the island area to prevent wolves, foxes and other carnivorous animals, as well as illegal hunters from breaking up the birds' building nests, laying eggs and breeding (·±Ö³). As a result, more and more birds are coming to the islands for sheltering and breeding.

1£®Why are more and more birds coming to the biggest salt lake in Northwest China?

A£®Because it is getting warmer and warmer.

B£®Because it is being reformed.

C£®Because the environment is getting more agreeable for them to live in.

D£®Because the people there are becoming richer and richer.

2£®What do the birds feed on?

A£®Floating fish and various grass.

B£®Grass growing in the water and different kinds of fish.

C£®Salt water and plenty of grains.

D£®Corn from the local farmers.

3£®According to the passage, we can infer that ________.

A£®over 20 kinds of birds come to the Bird Islands before March

B£®flocks of birds fly up to the whole sky over the islands to lay eggs

C£®visitors can see the birds from miles away

D£®the government has taken many measures to protect the district

4£®This passage is most probably taken from ________.

A£®a newspaper  B£®a document

C£®a storybook  D£®a science book