If you look at the sky one night and see something moving and shining that you have never seen before, it might be a comet (彗星).

　　A comet sometimes looks like a star. Like a planet, a comet has no light of its own. It shines from the sunlight it reflects (反射). Like the earth, a comet goes round the sun, but on a much longer path (轨道) than the earth travels.

       If a comet isn’t a star, what is it then?

　   Some scientists think that a large part of a comet is water frozen into pieces of ice and mixed with iron and rock dust and perhaps a few big pieces of rock. When sunshine melts (融化) the ice in the comet, great clouds of gas go trailing after it. These clouds, together with the dust, form a long tail.Many people perhaps have seen a comet. However no one knows how many comets there are. There may be millions of comets, but only a few come close enough for us to see.

　　An Englishman named Edmund Halley, who lived from 1656 to 1742, found out a lot about the paths that comets take through the sky. Some comets move out of our sight and never come back. Others keep coming back at regular times. A big comet that keeps coming back was named after Halley because he was the one who worked out when it would come back again. Maybe you have ever seen Halley’s Comets because the last time it came close to the sun and the earth was in the year 1986. Then people all over the world were outside at night to look at it. You will probably be able to see Halley’s Comets when it comes near the earth again.

1.A comet is like ________.

A. sun      B. moon     C. sunlight    D. the earth

2.A large part of a comet is ______.

A. water and rock

B. water frozen into pieces of ice and mixed with iron

C. ice, iron and rock dust

D. only a few big pieces of rock

3.Maybe many people _______.

A. haven’t seen any comets      B. have seen all comets

C. have seen a comet at daytime  D. have seen a comet

4.Some comets keep coming back ________.

A. at any time  B. at noon  C. at regular times  D. at daytime

5.Halley’s Comets came back _____.

A. in 1990    B. in 1980     C. in 1986      D. in 1989

1.In Switzerland it’s very important to be　　　    　　(准时).

2.They 　　　    　　(握手) and started a conversation at once.

3.Don’t be angry with him. 　　　   　　(毕竟), he is still a child.

4.They don’t usually have to 　　    　    　　(做计划) to meet their friend

5.He lives near the city mall. We can　   　　　　(顺便拜访他家) when we go there for shopping.

Most Canadian families love to have holidays 1 summer． Summer is a good season 2 holidays． It is very hot during the months of July and August． Children do not have any classes during these3months．

Some 4 like to stay at home during the holiday． They work in the garden, visit friends, 5 books, or 6 TV． Many families 7 their lunch to a park or somewhere far 8the city． They like to eat where there are many trees or there is a nice lake． If they live near the sea, they often go to the beach． They can fish, swim or enjoy the sun there．

Canada is a large country． Many families travel by 9 or by train to see interesting places． They also travel by plane to a foreign country． Many big cities have many famous buildings, theatres, shops and other places 10travelers．

1.A． for     　　　　　　 B． in      　　　　　　 C． on

2. A． to      　　　　　　 B． of      　　　　　　 C． for

3. A． one      　　　　　　B． two    　　　　　　 C． three

4. A． people   　　　　　　B． peoples  　　　　　　C． man

5.A． see   　　　　　　　 B． watch   　　　　　　C． read

6. A． see    　　　　　　  B． watch   　　　　　　C． look

7. A． takes  　　　　　　  B． take   　　　　　　  C． look

8. A． from   　　　　　　 B． away   　　　　　 C． to

9. A． car      　　　　　　B． a car   　　　　　 C． their car

10. A． for      　　　　　　B． in       　　　　　C． on