It had been snowing heavily for two days, all roads and streets. A. to block B. having blocked C. blocking D. blocked 题目和参考答案——青夏教育精英家教网—

阅读理解

　　An experiment was once done by Karl von Frish, in which he studied bee activities when they returned to their home called a hive (蜂房). The experiment showed that there was a means by which a bee communicated to other bees that it had found food. That was dance!

　　In fact, bees do two kinds of dances to tell other bees of their food discovery. First, there is a circle dance, in which the bee moves in a circle inside the hive. The circle dance is used when the food is not more than ten meters away. A second kind of dance done by the bee is a waggling (摇摆) dance. That is to say, the bee wiggles (摆动) the end of its body as it moves in a straight line, then it turns in a semicircle (半圆), runs straight again. The waggling dance is used when the food is more than ten meters away. Meanwhile, in the two dances, the bees smell the dancing bee that has found the food. The smell tells them where to find the flower and also what kind of flower to look for.

　　For this really interesting work, Karl von Frisch won a Nobel Prize.

1．Karl von Frisch won a Nobel Prize for ________.

[　　]

A．communicating with bees

B．having studied bees' activities

C．setting up an experimental base

D．the discovery of bees' looking for food

2．If the food is ________ away, the bee will move in a circle.

[　　]

3．Which of the following can show the waggling dance?

[　　]

4．The bees know where to find the food by the ________ of the bee that has found it.

[　　]

5．Which of the following statements may be true?

[　　]

A．Karl von Firsch did the experiment to find out if bees had a language of their own.

B．In their spare time, bees often do two kinds of dances.

C．Bees can communicate to one another as human beings do.

D．In the circle dance, the bee waggles the hind half of its body.

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The Fun They Had in School

On the page headed May l7，2517，Margie wrote in her diary，“Today Tommy found a real book!”

It was a very old book covered with dust．Margie’s grandfather once said that long ago all stories were printed on paper

“What is it about?” asked Margie

“School”

“School? What’s there to write about school? I hate school．”

Margie hated school now more than ever．The electric teacher had bee giving her drill after drill in geography and she had been doing worse and worse until her mother had finally sent for someone to fix the teacher

The man came with a whole box of tools．He turned off the elecuicity，and started to repair the teacher．There was a momtor that showed questions，and a hole where Margie had to put compositions and test papers．The electric teacher marked the paper quickly．

Margie asked Tommy，“Why would anyone write about school?”

“Because it’s the school they bad hundreds of years ago”

Margie read the book for a while，then said，“Anyway，they had a teacher？”

“Yes，but it was a man”

“A man? How could a man be a teacher?”

“Well，he just told the kids things and gave them homework”

“A man isn’t smart enough．”

“Sure he is．My father knows as much as my teacher’’

“But I wouldn’t want a strange in my house to teach me．”Margie argued

Tommy laughed．“The teacher didn’t live in the house．They had a special building and all the kids went there”

“And all the kids learnt the same thing?”

“Sure，if they were the same age”

They weren’t even half-finished when Margle’s mother called．“Margfa! School!”

Margie went into the school next to her bedroom，and the electric teacher was waiting far her them．It was the same way every day except Saturday and Sunday

The monitor lit up，and it said，“Please put yesterday’s homework in the proper hole”

Margie sighed and threw a dirty sock at the machine．She was thinking about the old days．All the kids from the whole neighborhood came to the school，Iaughing and shouting in the yard．They could even help one another with the homework

And the teachers were people!

How happy they were in the old days，Margie thought．

1．When did the story in the passage take place?

2．Wny did Margie hate school?

3．How did Margie feel when she heard that teachers of hundreds of years ago were people instead

of machines?

4．How did kids in Margie’s time receive education?

5．What does the underlined word“They”refer to in the title?

A woman suffering from cancer during pregnancy can pass the disease on to her unborn child, scientists have shown in a study that solves a puzzle that has confused doctors for a century.

The rare occurrence of a mother and child appearing to share the same cancer---of which there have been about 30 known cases---is a result of genetic mutation (基因突变) that allows the cancer to pass to the baby unnoticed.

There was previously no genetic evidence to explain why a child’s immune system would not recognize and destroy any invasive cancer cells that were of maternal---and therefore, foreign origin.

The new study, led by Mel Greaves, of the Institute of Cancer Research (ICR), and published in Proceedings of the National Academy of Sciences, used advanced genetic fingerprinting to prove that infant’s leukaemic cells (白血病细胞) were unquestionably of maternal origin.

The case, involving a Japanese mother aged 28 and her daughter, showed that both patients’ leulaemic cells carried the identical transformed cancer gene BCR-ABL even though the infant had not inherited (遗传的) this gene.

This meant that the child, who had cancer diagnosed at 11 months, old, could not have developed this type of leukaemia in isolation.

To investigate how the cells could have crossed the placental barrier (胎盘膜) and survived in the offspring (后代), the scientists looked for evidence of some form of immunological (免疫学的) acceptance of tolerance of the foreign cells by the foetus (胎儿).

Professor Greaves, who worked with colleagues in Japan with funding from Leukaemia Reasearch, said that it had bee assumed that cancer spread was impossible because of the placenta’s role in preserving materno-foetal (母体-胎儿) health.

61. What is the main idea of the passage?

A. An Unborn child can be infected by the mother with cancer.

B. Scientists have solved a confusing puzzle for a century.

C. A genetic mutation leads to the cancer of the unborn child.

D. Women can’t be cured during pregnancy.

62. Which of the following statements is true according to the passage?

A. There are many cases of a genetic mutation causing cancer.

B. No genetic evidence is known why the unborn child was infected.

C. Mel Greaves’s study indicates the infant’s leukaemic cells were of maternal origin.

D. Based on Mel Greaves’s study, mothers may know cancer’s transportation.

63. What was used to prove the infant’s leukeaemic cells were from the mother?

A. genetic mutation B. placental barrier

C. immune system D. genetic fingerprinting

64. What does the underlined phrase “in isolation” mean in the 6 paragraph?

A. in a hurry B. in no way C. on purpose D. on its own

65. What can we infer from the passage?

A. The placental barrier doesn’t prevent any disease.

B. Earlier theories supposed cancer couldn’t go across placenta.

C. Scientists have got evidence for some diseases.

D. Professor Greaves gets money from the government.