67.Necessary conditions for life on Mars mentioned in the passage may include　　　　 .

A.lava and energy

B.water and radiation from space

C.gases and lava

D.water and protection from radiation

答案　 64.C　 65.D　 66.B　 67.D

Passage 47

(07·福建E篇)

Dogs wag(摇摆) their tails in different directions depending on whether they are excited and wanting to move forward or threatened and thinking of moving back, a study has found.

　　　 Researchers in Italy　 examined the tail wagging behaviour of 30 dogs, catching their responses to a range of stimuli(刺激物) with video camems. To conduct the study they chose 15 male dogs and 15 female ones aged between one and six years. The dogs were all family pets whose owners had allowed them to take part in the experiment at Bari Umversity. The dogs were placed in a large wooden box with an opening at the front to allow for them to view various stimuli. They were tested one at a time.

　　　 The researchers led by Professor Giorgio Vallortigara of the University of Trieste found that when the dogs were shown their owners-a positive expenence-their tails wagged energetically to the right side. When they were shown an unfamiliar human they wagged to the right, but with somewhat less enthusiasm. The appears of a cat again caused a right-hand side wag, although with less intensity again. The appearance of a large unfamiliar dog, similar to a German shepherd, changed the direction of tail wagging to the left. Research ers supposed the dog was thinking of moving back. When the dogs were not shown any stimuli they tended to wag their tails to the left, suggesting they preferred company. While the changes in the tail wagging were not easily noticed without the aid of video, it was thought that the findings could help people judge the mood (心情) of dogs. Computer and video systems, for example, could be used by professional dog trainers to determine the mood of dogs that they were required to approach.

66.According to the passage, Dr. Clarke was so excited because　　 　　.

A.such caves could provide energy for life

B.they had finally found the caves on Mars

C.such caves would be perfect places to hunt for life

D.scientists had long been looking for these caves

65.We can learn from the passage that　　　　　 .

A.water has already been found on Mars

B.the scientists found all the caves at night

C.it is certain that there is life in these caves

D.the surface of Mars is bitterly cold, radiation-soaked and dry

64.What does the passage mainly talk about?

A.How the caves were formed on Mars.

B.How scientists found these caves on Mars.

C.Caves on Mars may be full of hot air or a sign of life.

D.Scientiste have completely recognized the surface of Mars.

67.This passage is most likely to be found in ______

A. a travel guide　　　　　　　 　　　　　　　B. a story book

C. a technical report　　　　　　　　　　　　 D. a geography book

答案　 64.D　 65.C　 66.A　 67.D

Passage 46

(07·福建C篇)

Scientists have found what look like caves on Mars(火星), and say they could be protecting life from the planet’s terrible environment.

The first caves discovered beyond the Earth appear as seven anysterious black dots on the pictures sent back by NASA’s Mars Odyssey orbiter. Each as large as a football field, they may be openings into natural caves below the Martian suface.

“If there is life on Mars, there is a good chance you’d find it in caves,” said Jut Wynne,one of the reseachers who noticed the features while working on a US Geological Survey Mars Cave Detection Program.

Jonathan Clarke, a geologist with the Mars Society of Australia, yesterday described the discovery as exciting.

One photo taken at night by an infrared imager(红外线成像器) showed one hole to be unusualy warm, suggesting hot air trapped during the day is flowing out.

“I said:‘Wow, that’s a cave’” Dr. Clarke said excitedly. “People have been looking for these for a long time; now we have found them.”

He agreed such caves would be perfect places to hunt for life escaping from the bitterly cold,radiatiion-soaked(充满辐射的), dry surface.

“Tiny drops of water could collect inside,” he said. “If there are gases coming out, they could provide energy for a whole range of bacteria. A cave is also a protection from radiation; the surface of Mars is exposed to high levels of space radiation.”

The caves probably formed when tube-shaped lave flows(管状岩浆流) spread across the planet long ago. The outside of the tubes cooled, forming solid walls, while something hotter inside allowed the remaining have to flow out, forming caves.

66. According to the passage,______ play with the most important role in the spreading seeds.

A. animals.　　　　　　 B. droppings　　　　 C. fruits　　　　　　　 D. winds

65. We can learn from the passage that_______

A. tree leaves are green all the lime in the monsoon forest

B. there is a dry season in the cloud forest on tropical mountains

C. clouds help the plants in the rain forest near the deserts to grow

D. the formation of climate in the rain forest has little to do with the trees

64. The climate of the rain forests near the equator is______

A. mild, wet and windy

B. hot, rainy and foggy

C. hot, wet and cloudy

D. warm, wet and sunny

59. We can learn from the passage that ______

A. human life will not last more than 120 years in the future

B. humans have to take medicine to build new skin cells now

C. much needs to be done before humans can have a longer life

D. we have already solved the technical problems in building new cells

答案　 56.A　 57.A　 58.D　 59.C

Passage 45

(07·辽宁C篇)

Most rain forests lie close to the equator( where the climate is often mild and there are long hours of sunshine. The warmth of the land heats the air above, causing it to rise and tiny drops of water to fall as rain. The rainfall can reach at least 98 inches a year. This wet, warm world with plenty of sunlight is perfect for plants to grow so the trees grow fast with green leaves all the year round, The trees themselves also have an effect on the climate. They gather water from the soil and pass it out into the air through their leaves. The wet air then forms clouds, which hang over the treetops like smoke. These clouds protect the forest from the daytime heat and nighttime cold of nearby deserts, keeping temperatures fit for plant growth

Rain forests slightly farther away from the equator remain just as warm, but they have a dry season of three months or morn when little rain falls. Tree leaves fall during this dry season and new leaves grow when the wet season or monsoon (雨季) begins. Thus these areas are known as the “monsoon forest”.

Another type of rain forest grows on tropical mountains. It is often called the “cloud forest” because clouds often hang over the trees like fog.

The rain forest is the ideal place for the growth of many different trees. Most of them depend on animals to eat their fruits and spread their seeds. When the fruits are eaten, the seeds inside them go undamaged through animals’ stomachs and arc passed out in their droppings. The seeds lying on the forest floor then grow into new trees.

58. Humans may live longer in the future because_____

A. heart disease will be far away from us

B. human brains can decide the final death

C. the basic materials of cells will last forever

D. human organs can be repaired by new medicine