阅读理解

　　Why don't birds get lost on their long flights from one place to another? Scientists have puzzled over this question for many years. Now they are beginning to fill in the blanks.

　　Not long ago, experiments showed that birds rely(依赖) on the sun to guide them during daylight hours. But what about birds that fly at night? Tests with artificial(人造的) stars have proved that certain night-flying birds are able to follow the stars on their long-distance flights.

　　A dove had spent its lifetime in a cage and had never flown under a natural sky. Yet it showed an inborn ability to use the stars for guidance. The birds's cage was placed under an artificial starfilled sky. The bird tried to fly in the same direction as that taken by his outdoor cousins. Any change in the position of the make-believe stars caused a change in the direction of his flight.

　　Scientists think that doves, when flying in daylight, use the sun for guidance. But the stars are obviously their principal(主要的) means of navigation(or flying). What do they do when the stars are hidden by clouds? Obviously, they find their way by such landmarks as mountain ranges, coastlines, and river courses. But when it's too dark to see these, the doves circle helplessly, unable to get their bearings(方位).

1．The reason why birds don't get lost on long flights ________.

[　　]

A．is known by everybody

B．still remains a mystery

C．has been discovered recently

D．has been known to scientists for years

2．Experiments showed that ________.

[　　]

A．birds rely on the sun to guide them

B．birds rely on the stars to guide them

C．birds are likely to get lost if there aren't artificial stars

D．day-flying birds rely on the sun while night-flying birds rely on the stars

3．The experiment on the dove indicated(表明) that ________.

[　　]

A．a bird that has been caged will not fly long distances

B．some birds seem to follow the stars when they fly at night

C．a bird having spent its lifetime in a cage has to- be taught how to navigate

D．birds can fly in the same direction as that taken by their cousins

4．Under artificial stars, the bird in the cage ________.

[　　]

A．tried to fly in the same direction as birds not caged

B．changed direction when the position of the stars was changed

C．would not fly well

D．both A and B

5．In total darkness, doves ________.

[　　]

A．circle helplessly

B．use landmarks

C．find their way by clouds

D．fly back home

根据对话意思和所给首字母，写出完整正确的单词。

Cindy: Do you know Zhalong?

Beibei: Yes,  it's a very 1. i_________wetland in the world.

Cindy: Where is it?

Beibei: It's in Heilongjiang Province in north-east China.

Cindy: Why do lots of2.) t_________go there every year?

Beibei: Because it' s a nature reserve. They go there3.f_________birdwatching.

Cindy: What kind of birds live there?

Beibei; There're many different kinds of birds,  including some endangered 4.o_________.

Cindy: What does the reserve provide for the birds? Is it a great place for them?

Beibei: Yes,  it 5. p_________food and shelter for them.

Cindy: Oh,  it's interesting. Thanks. Beibei: It's my pleasure.

One day a red rose blossomed(开花)in a forest. A pine tree not far away said: "What a beautiful flower. I wish I could he that lovely.

    The rose said: "I am the most beautiful plant in this forest. "

    Then the rose looked at a cactus（仙人掌）and said_: " Look at that ugly plant. It is full of thorns (刺)"

    The pine tree said： "Red rose, you have thorns, too. " Sometimes, the rose would look at the cactus and say _: "This plant is useless. How sorry I am to be his neighbor. "

    Summer came and the plants and animals needed water, but no rain fell. One day the rose saw birds stick(刺) their beaks(鸟嘴) into the cactus and then fly away. The rose asked what the birds were doing. The pine tree explained that the birds got water from the cactus. The pine tree told the rose_: "You can also drink from it. The birds can bring water to you if you ask the cactus for help. "

    The rose fell ashamed(羞愧的), but asked the cactus for help. The cactus kindly

agreed and the birds filled their beaks with water for the rose’s roots(根).

    So the rose learned：never judge(判断) anyone by appearance(外表).

1.At the beginning of the story the rose thought that the cactus was     .

   A. ugly   B. lovely  C. beautiful

2.Both the rose and the cactus have_______.

   a .thorns  B. leaves  C. fruit

3.The underlined word "useless" in this passage means "____ " in Chinese

   A. 无营养的 B. 不友好的 C. 无用的

4.Which of the following is True according to the story?

   A. The birds could get water from the pine tree.

   B. The rose got water from the cactus at last.

   C .The pine tree wanted to get water from the rose.

5.What’s the best title (标题) for the passage?

   A. Plants and birds

   B. Ways of growing roses

   C. Appearance isn't everything.