The birds （） at the sound of the gun. ()。

—__（）—Wow，so beautiful

It is time that the government （）(take) measures to protect the rare birds and animals.

第三人称包括（）

The birds()at the sound of the gun.

It is time the government（）that measures to protect the rare birds and animals.

At the sound of the gun, the birds flew ____ all directions.
A、to
B、from
C、in
D、by

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The island where these rare birds nest has been declared（）.

Birds have nnew fashions and learn（)from each other.
A.nor
B.none
C.not
D.no

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根据以下内容回答题：No one knows for sure why birds migrate．One theory of migration says th
根据以下内容回答题：
No one knows for sure why birds migrate．One theory of migration says that ancient birds of the northern part of the earth were forced southward during the Ice Age，when ice covered large parts of Europe，Asia and North America．As the ice melted，the birds came back to their homelands，spent the summer，and then went south again in winter．Gradually，these comings and goings became habits，and birds now migrate though much of the ice has gone． Another theory proposes that the ancient home of all modern birds was the tropic areas．There lived so well that the region became overcrowded．Many species had to move northward．During the summer，these birds found plenty of room and food．In winter，however，food be-came scarce and they had to return to the south． A newer theory is that increasing daylight stimulates certain glands（腺）in the bird’s body and prepares it for migration．One scientist is able to make birds migrate in midwinter by expo-sing them for two months to artificial daylight．Recoveries of marked birds indicate that they fly north as soon as they are set free．The conclusion is that the urge to migrate is determined by changes in the bird’s body which take place under seasonal changes in the length of daylight． This theory would account for the fact that not all birds migrate at the same time．Each sDecies seems to have its own schedule．The theory would also account for the regular time and rou‘tes of migration．Birds arrive at a given place year after year．Unfavorable weather delays them only a few days．Total hours of daylight，rather than weather，start them on the way． How birds find their way to the same place year after year and why they follow their own Darticular route are still mysteries．They evidently do not follow known landmarks，for many young birds migrate alone without the help of experienced adults．
We can conclude from the first paragraph that__________ ．
A.during the Ice Age，the whole Europe was covered with ice
B.the south used to be the homelands of all birds
C.scientists can confidently explain why birds migrate now
D.migration of birds can be explained by the change of ice on earth


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In the month of September, in Britain, you may see large numbers of birds （1)_____ on roof
In the month of September, in Britain, you may see large numbers of birds (1)_____ on roofs and telegraph wires. These birds are swallows. They are (2)_____ together because, very soon, they will be flying. (3)_____ to much warmer lands, where they will find (4)_____ the small flying insects on which they (5)_____. There are no such insects (6)_____ in Britain during the winter; it is (7)_____ cold for them.
The swallows settle, fly off, swoop, and (8)_____ again. This they do many times, for they are making short (9)_____ flights in order to be fit for the long journey (10)_____ them.
(11)_____ of these migrating birds leave Britain in the autumn. They fly (12)_____ for hundreds of miles (13)_____ they reach the warm lands of Africa. But not all the birds get there, for many of them perish in the stormy weather they meet with (14)_____.
In the spring of the following year they" (15)_____ the long and tiring journey back to Britain.
They return to the identical barn or tree in the (16)_____ district which they had left the (17)_____ autumn. How do these birds find their (18)_____ there and back over such vast distances？ Nobody knows exactly (19)_____, but it has something to do (20)_____ winds and air currents.
A．being perched
B．perched
C．being perching
D．be perched

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Under man-made stars, the bird in the cage ______.A．tried to fly in the opposite direction
Under man-made stars, the bird in the cage ______.
A．tried to fly in the opposite direction of birds not caged
B．changed direction when the position of the stars was changed
C．wouldn't fly well
D．stayed where they were

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