题目内容
If a man in a spaceship looked down at the earth, he would see mainly water. He might think that the earth was one giant ocean with little land.
Nearly seven-tenths of the earth's surface is covered by water. One ocean, the Pacific (
太平洋), has an area of 63 million square miles.Many years ago people thought that the land under all this water was flat. Now they know that this is not true. There are as many mountains under the sea as there are on the land.
At first, there was very little salt in the sea. The salt was brought into the, sea by rivers. It is possible to measure the age of the earth by measuring the amount of salt in the sea. Scientists can calculate how many years it took for this amount of salt to be carried from the land into the sea.
(1)Nearly ____of the earth's surface is covered by water.
[ ]
A .seven-tenths |
B .three-tenths |
C .seven-tenth |
D .three-tenth |
(2)Long time ago people thought that the land under the sea was_____
.[ ]
A .mountains |
B .a ball fo gas |
C .full of coal |
D .flat |
(3)In fact, under the sea the land _________
.[ ]
A .is full of mountains |
B .is almost flat |
C .is full of coal |
D .is a ball of gas |
(4)At first, there was ________
.[ ]
A .a little salt in the sea |
B .much salt in the sea |
C .little salt in the sea |
D .no salt in the sea |
(5)We can know the age of the earth by measuring ________
.[ ]
A
.the amount of water in the seaB
.the amount of flat in the seaC
.the amountofmountainsintheseaD
.the amount of salt in the sea完形填空
Plants are very important 1 things. Life could not go 2 if there were no plants. This is because plants can make food from air, water and sunlight. But animals and man cannot 3 so. Animals get their food by eating plants and 4 animals. Man gets its food by eating plants and animals too. 5 animals and man 6 plants in order to 7 . This is why we find that there are so many plants around us.
If you look 8 at the plants around you, you will find that there are many types of plants. Some plants are large, 9 others are small. 10 plants are green. There are two sorts(种类)of plants: flowering plants and non-flowering(不开花的)plants.
Flowering plants have roots(根),stems(茎),leaves, flowers and fruits(果子). 11 all the trees around us are flowering plants. Flowering plants 12 make seeds(种子). The sends 13 by the fruits. Some fruits have one seed, some have two, three or four, and some have many seeds. But a few fruits have no seeds 14 . 15 example of a fruit 16 seeds is banana fruit.
Most non-flowering plants do not grow from seeds. They grow from spores(孢子). Spores are small. Some spores are 17 small and 18 that they can float(漂浮) 19 the air. We may say that spores are quite different from seeds. When these spores 20 on wet and shady(阴凉的)places, they usually grow into plants.
1. A.live |
B.lively |
C.living |
D.lived |
[ ] |
2. A.through |
B.over |
C.down |
D.on |
[ ] |
3. A.hope |
B.do |
C.think |
D.make |
[ ] |
4. A.another |
B.the other |
C.other |
D.others |
[ ] |
5. A.Though |
B.And |
C.But |
D.So |
[ ] |
6. A.need |
B.want |
C.find |
D.have |
[ ] |
7. A.grow |
B.live |
C.work |
D.eat |
[ ] |
8. A.careful |
B.clear |
C.carefully |
D.clearly |
[ ] |
9. A.while |
B.when |
C.since |
D.as |
[ ] |
10. A.A great deal of |
B.Lot of |
C.More |
D.Most |
[ ] |
11. A.Between |
B.Except |
C.Almost |
D.Hardly |
[ ] |
12. A.should |
B.can |
C.may |
D.must |
[ ] |
13. A.are born |
B.are hidden |
C.are stored |
D.are kept |
[ ] |
14. A.any longer |
B.any more |
C.at last |
D.at all |
[ ] |
15. A.The |
B.An |
C.A |
D.For |
[ ] |
16. A.without |
B.with |
C.full of |
D.of |
[ ] |
17. A.too |
B.very |
C.so |
D.much |
[ ] |
18. A light |
B.active |
C.little |
D.strong |
[ ] |
19. A.on |
B.in |
C.by |
D.above |
[ ] |
20. A.put |
B.move |
C.place |
D.fall |
[ ] |