The first telegraph cable was laid under the sea between England and France in 1850.Cables are much  1 and heavier than telegraph wires.There are a number of reasons for this:one reason is that the salt water of the sea harms  2  telegraph wires,and so they have to be 3  , another is that,because electricity 4 easily through water,wires have to be 5  to prevent electric signals which are passing through them 6 escaping and getting lost in the sea;a third reason is that cables have to be very strong 7 they will break while they are being 8 along the bottom of the sea from a ship sailing on the surface.

  The 9  cables that men tried to lay  10  England and America broke and were 11 during storms.At last,after nine years of hard work,the two English-speaking nations of Britain and America were 12 in 1866 by the electric telegraph under the sea.

    Later,all the different 13 of the world were joind up by a 14 of cables.It is 15 easy to send a message by cables as it is to 16 an ordinary telegram,and it takes no longer for a message to 17 half way round the world than from one town to the 18 .Every hour of the day and night 19 are being flashed under the ocean to and20 every country in the world.

1. A.thicker        B.better      C.longer       D.larger

2. A.ordinary       B.special     C.plain        D.simple

3. A.raised         B.fixed       C.protected    D.repaired

4. A.comes          B.passes      C.escapes      D.sends

5. A.hid            B.circled     C.covered      D.dressed

6. A.from           B.through     C.by           D.into

7. A.so             B.or          C.but          D.and

8. A.lined          B.pulled      C.laid         D.covered

9. A.best           B.most        C.first        D.thickest

10. A.between        B.around      C.beside       D. among

11. A.cast           B.thrown      C.drawn        D.lost

12. A.fixed          B.joined      C.met          D.mixed

13. A.cities         B.countries   C.parts        D.peoples

14. A.set            B.packet      C.sort         D.network

15. A.very          B.so           C.as            D.not

16. A.make          B.send         C.use           D.write

17. A.find          B.travel       C.visit         D.meet

18. A.next          B.second       C.last           D.another

19. A.news          B.pictures     C.messages       D.telegrams

20．A.out           B.in           C.from           D.off

　　The first telegraph cable 1 under the sea 2 England and France in 1850． Cables are 3 thicker and heavier than telegraph wires． There are 4 reasons 5 this: one reason is that the salt water of the sea harms ordinary telegraph wires, and so they have to be 6 ; 7 is that, because electricity passes easily through water, wires have to be covered 8 electric signals 9 are passing through them from escaping and 10 in the sea; 11 third reason is 12 cables have to be very strong 13 they will break 14 they are being 15 16 the bottom of the sea from a ship 17 on the 18 ．

阅读理解

　　The first telegraph cable (电缆) was laid under the sea between England and France in 1850. Cables are very much thicker and heavier than telegraph wires. There are a number of reasons for this. One reason is that the salt water of the sea harms ordinary telegraph wires, and so they have to be protected. Another is that, because electricity passes easily through water, wires have to be covered to prevent electric signals which are passing through them from escaping and getting lost in the sea. A third reason is that cables have to be very strong or they will break while they are being laid on the bottom of the sea from a ship sailing on the surface.

1．People put the first cable on the bottom of the sea between England and France ________ .

[　　]

A．about half a century ago

B．in the Middle Ages

C．in the middle of the 18th century

D．in the middle of the 19th century

2．Ordinary telegraph wires have to be protected in the sea because________ .

[　　]

A．they are not thick enough

B．they are not strong enough

C．salt water of the sea is very harmful to them

D．they are made of metal

3．Electricity signals easily escape and get lost________ .

[　　]

4．Cables under the sea have to be made very strong, otherwise ________ .

[　　]

A．the sailing ship may break them

B．fishes may bite them

C．they may rise above the water

D．they may break when being laid down into the sea from a ship

5．The main idea of the passage is________ .

[　　]

A．Electricity passes easily through water

B．It is difficult to lay cables into the sea

C．Ordinary telegraph wires can't be kept long under the sea

阅读理解

　　The first telegraph cable (电缆) was laid under the sea between England and France in 1850. Cables are very much thicker and heavier than telegraph wires. There are a number of reasons for this. One reason is that the salt water of the sea harms ordinary telegraph wires, and so they have to be protected. Another is that, because electricity passes easily through water, wires have to be covered to prevent electric signals which are passing through them from escaping and getting lost in the sea. A third reason is that cables have to be very strong or they will break while they are being laid on the bottom of the sea from a ship sailing on the surface.

(1) People put the first cable on the bottom of the sea between England and France ________ .

[　　]

A．about half a century ago

B．in the Middle Ages

C．in the middle of the 18th century

D．in the middle of the 19th century

(2) Ordinary telegraph wires have to be protected in the sea because________ .

[　　]

A．they are not thick enough

B．they are not strong enough

C．salt water of the sea is very harmful to them

D．they are made of metal

(3) Electricity signals easily escape and get lost________ .

[　　]

(4) Cables under the sea have to be made very strong, otherwise ________ .

[　　]

A．the sailing ship may break them

B．fishes may bite them

C．they may rise above the water

D．they may break when being laid down into the sea from a ship

(5) The main idea of the passage is________ .

[　　]

A．Electricity passes easily through water

B．It is difficult to lay cables into the sea

C．Ordinary telegraph wires can't be kept long under the sea