题目内容

Even a drop of water ______because it is so important to all the living things.

A.
must waste
B.
must be wasted
C.
mustn’t waste
D.
mustn’t be wasted

D

这题考查情态动词的被动语态的用法，“情态动词+be+done”，句意是：一滴水都不能浪费，因为它对每个生物都是有用的，注意用否定式。

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In most situations, light helps us see. But nowadays humans are using so much that it is in fact a kind of pollution.

When it comes to looking at the night sky, too much light makes it d 1. for us to watch some of life’s most wonderful views: stars, p 2. and even galaxies(星系).

According to scientific research, about 2, 500 stars can be seen by the human eye without u 3. any special equipment(设备). But because of light pollution, you can only see 200 to 300 stars from today’s countryside, and no more than ten stars from a city. In most big c 4., people cannot see the sky filled with stars like they did in their childhood.

Light pollution affects more than just our view of sky. Research s 5. that lots of nighttime light can harm wildlife, too.

When birds fly to a 6. place over cities, they sometimes get lost by the brightness and fly in circles(圈) u 7. they drop from tiredness. Sea turtles need dark beaches for laying eggs, but they can’t find their ideal places because of those bright lights.

Too much light at night m 8. even affect human health, but scientists are not sure of that. They are still learning more.

In order to prevent things from going w 9., governments and some organizations are working to reduce light pollution. Many cities and towns have taken action to reduce the use of lights at night. Lights are used only when and where they are r 10. needed.

Hopefully, in the near future, humans can enjoy the clear and beautiful sky again and all the wildlife will live a peaceful and undisturbed life, too.

The world is nor only hungry，but it is also t 1 for water．This may seem strange to you，since nearly 70％of the earth is c 2 with water：But about 97％of this huge amount is sea water，or salt water．Man can only drink and use the other 3％——the fresh water from rivers，lakes，

underground，and other sources. Even w 3 ，some of it has been p 4 ．Now our need for water is i 5 -almost day by day．We must take steps to solve this prob1em，or we can’t a 6 a worldwide water shortage later on．

We all have to learn how to s 7 water．One of the first steps is to develop ways of reusing it．

Today in most large cities，water is used only o 8 and then sent out into a sewer system(下水道)．But it is possible to get used water to a purifying(净化)factory．There it can be purified so t9 it can be used again．

The world’s water shortage is a big p10 for humans．We must save every drop of water and keep our rivers and lakes clean．

In most situations, light helps us see. But nowadays humans are using so much that it is in fact a kind of pollution.

When it comes to looking at the night sky, too much light makes it d 76 for us to watch some of life’s most wonderful views: stars, p 77 and even galaxies(星系).

According to scientific research, about 2, 500 stars can be seen by the human eye without u 78 any special equipment(设备). But because of light pollution, you can only see 200 to 300 stars from today’s countryside, and no more than ten stars from a city. In most big c 79 , people cannot see the sky filled with stars like they did in their childhood.

Light pollution affects more than just our view of sky. Research s 80 that lots of nighttime light can harm wildlife, too.

When birds fly to a 81 place over cities, they sometimes get lost by the brightness and fly in circles(圈) u 82 they drop from tiredness. Sea turtles need dark beaches for laying eggs, but they can’t find their ideal places because of those bright lights.

Too much light at night m 83 even affect human health, but scientists are not sure of that. They are still learning more.

In order to prevent things from going w 84 , governments and some organizations are working to reduce light pollution. Many cities and towns have taken action to reduce the use of lights at night. Lights are used only when and where they are r 85 needed.

Hopefully, in the near future, humans can enjoy the clear and beautiful sky again and all the wildlife will live a peaceful and undisturbed life, too.

76. ________ 77. ________ 78. _______ 79. _______ 80. _______

81. ________ 82.________ 83. _______ 84. _______ 85. _______

Even a drop of water ______because it is so important to all the living things.

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