B
It is natural that children are curious about the world around them. For example, they want to know how their hearts beat. They want to know why the ocean water tastes salty.
As children grow up, they become curious about different kinds of things. When they are babies, they are interested in the parts of their bodies and in the smiles of their mothers. They become interested in the physical world around them: the plants, the animals, the sky. Later, they become interested in the things that people have made: wheels, bicycles, cars. And when they are adults, their curiosity continues. Sometimes this curiosity leads to a career (生涯、职业) in science.
Scientists spend their lives trying to find out about the world．Those who work with the earth sciences study the earth, the oceans, and the skies. Other scientists who study living things work with the biological sciences. A third group of scientists study the physical sciences, e. g. physics, chemistry .
These scientists have already discovered a lot about our world．For example, they tell us why your heart beats fast when you run. They say that when you are quiet, your heart normally beats sixty-five or seventy-five times a minute. Your heart is a pump (泵) that pumps blood to all parts of the body. The blood carries oxygen and nutrition. When you run, your muscles work very hard and use the nutrition that the blood carries to them. The muscles need oxygen, too . So your brain sends a signal to the heart. The signal means that the muscles need more nutrition and oxygen. Then the heart beats fast and sends blood quickly to the muscles. It may beat 90 to 140 times a minute.
Of course, scientists cannot answer all of our questions. If we ask, “Why does the ocean water taste salty” scientists will say that the salt comes from rocks. When a rock gets very hot or very cold, it cracks. Rain falls into cracks. The rain then carries the salt into the earth and into the rivers. The rivers carry the salt into the ocean. But then we ask , “What happens to the salt in the ocean? The ocean does not get saltier every year.” Scientists are not sure about the answer to this question.
We know a lot about our world, but there are still many answers that we do not have, and we are curious.
45．According to the passage, which of the following statements is true?
A．People are curious in the same way.
B．People in different countries are interested in different things.
C．Men and women are curious about different things.
D．People of different ages are interested in different things
46．Scientists who work with the biological sciences study____.
A．the earth , the oceans and the sky B．man-made things
C．plants and animals D．ocean water
47．When you run, your muscles need ____.
A．more nutrition and oxygen B．more signals C．more salt D．water
48．A rock cracks _____.
A．in wet regions B．in dry regions
C．at very high or very low temperatures D．when salty water falls in
第二节：完形填空（共20小题；每小题1.5分，满分30分）
阅读下面短文，掌握其大意，然后从21~40各题所给的四个选项（A、B、C和D）中，选出最佳选项。
Jane’s mother worked on the farm from dawn till dark, which just could make ends meet. To make Jane live a 21 life. Mother was very carful about spending money. 22 , Jane didn’t understand her. Every day Mother was busy with her 23 while Jane was studying at school, so they had little time to enjoy themselves.
One day, Mother realized Jane was unhappy and even 24 to her, so she decided to go 25 with Jane to make Jane happy.
On Sunday morning they went happily to the snowfield. Since they were 26 in white clothes, the manager advised them to buy ski clothes. He said 27 there was an accident, they might be easily 28 in their ski clothes. Mother couldn’t 29 them, so she refused.
Then they went skiing in their white clothes. They were skiing happily on the 30 when suddenly the snowfield began to 31 . It was the snowslide(雪崩). They ran a long way and 32 the snowslide finally, but they couldn’t find their way. Later, a helicopter was flying above, 33 people on it couldn’t see or hear them. Jane was 34 because she had hurt her head seriously and 35 dropped on the snow. Just then an idea struck Mother. She pierced (刺破) her wrist 36 and then bright red blood dropped down on the snowfield. A red SOS was on the snow. At last Jane 37 , but Mother died.
Every time I 38 the blood dropping onto the snowfield, I feel 39 . I believe anyone who hears the tragedy will 40 Mother for her selfless love to her daughter.
21. A. happy B. healthy C. busy D. meaningful
22. A. Moreover B. However C. Anyway D. Though
23. A. writing B. housework C. work D. research
24. A. unfriendly B. loyal C. kind D. cruel
25. A. skating B. dancing C. hiking D. skiing
26. A. all B. both C. either D. every
27. A. now that B. in case C. as though D. even if
28. A. searched B. examined C. found D. caught
29. A. pay B. manage C. afford D. stand
30. A. mountain B. farmland C. playground D. snowfield
31. A. change B. melt C. shake D. jump
32. A. escaped B. passed C. experienced D. overcame
33. A. but B. so C. since D. while
34. A. in despair B. in danger C. in peace D. in ruins
35. A. hair B. blood C. tears D. jewels
36. A. carefully B. slowly C. immediately D. hardly
37. A. cried B. died C. woke D. survived
38. A. find out B. think of C. suffer from D. come across
39. A. satisfied B. curious C. anxious D. painful
40. A. admire B. envy C. reward D. thank
20．We met _____ and have become good friends since then.
|
A．by mistake |
B．by accident |
C．by ourselves |
D．by the way |
19．_____ your advice, I’m sure to consider it and give you reply in time.
|
A．In spite of |
B．But for |
C．Because of |
D．As for |
18．--- Tom has a lot of parties recently.
---Yes, that may ____ why he didn’t do well in the test.
A, sum up B. add up to C. account for D. make sense of
17．I’m ____a diet, since I put ____ weight easily.
|
A．in; on |
B．on; in |
C．in; in |
D．on; on |
