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The sharp, pointed needles of the cactus_________.
A．are their flowers
B．can take the place of their leaves
C．can protect itself
D．store water
答案
更多“The sharp, pointed needles of the cactus_________.A．are their flowersB．can take the place”相关的问题
第1题
A mature elephant is only subjected to training when______.
A．it is with other elephants
B．the mahout has established a good relationship with it
C．the animal is feeding normally
D．it needs to be controlled with a sharp pointed stick
第2题
Cactuses(仙人掌)live in dry areas. They may not get much water where they live. The cactus' long roots lie near the surface of the ground. They can get water from desert rains. And since the roots have bark (皮)covering them, they can absorb the water fast. Because the cactus has no leaves, it seems to do the job of making food for the plant and of storing it than out, not much of the plant faces the direct drying sunlight. These broad stems have a great deal of room for storing the water and a thick covering for protecting it. The plant's sharp, pointed needles (针) keep animals from sucking its liquid. However, cactus plants have saved the lives of people in the desert.
_________of the cactus take in water.
A．The leaves
B．The stems
C．The needles
D．The roots
第3题
Crocodiles(鳄鱼)lay their eggs and leave them under leaves or sand. Baby crocodiles have special sharp teeth with which to break their way out of the shells. Crocodiles only live where it is hot. They are found in India, Australia, Africa and America. They spend most of their time lying around in the mud or the rivers. The crocodiles long powerful tail is used when the animal is swimming. It is also an excellent weapon, because it can be swung with great speed and force. One blow will knock down a man or even a big animal at once. The crocodile is very well protected against its enemies by the hard bony plates which cover most of its body, but because of the way its neck is formed, it cannot turn its head from side to side and so it can only see in front of itself. The crocodile has its teeth cleaned by the crocodile bird. For its food this bird takes the bits left in the crocodiles mouth. This helps the crocodile, which cannot clean its own teeth, for it cannot move its tongue up and down. With its rows of terrible pointed teeth it seizes its food, which may be a fish, an animal, or even a careless human being, and then holds it below the water until it is drown to death. The long-nosed crocodile is shy and timid and because of this, the people of West Africa where it lives, sometimes catch it for food. Many, many centuries ago there were crocodiles in England. We know this because we have found their bones buried far down in the earth on which London is built. But the Britain of today is too cold for them to live in. Crocodiles may grow to over thirty feet in length. When they lie floating in the water, they look like floating tree-trunks and it is often impossible to tell that they are there.
The female crocodile______.
A．buries her eggs
B．sits on her eggs
C．carries her eggs
D．eats her eggs
第4题
Space-Age Archeology
It's a strange partnership, but a very effective one: Satellites and space-shuttle-carried radar are helping archeologists. How？ By "seeing" through sand or through treetops to locate important archeological sites.
The traditional tools of archeologists are shovels and picks. But high technology is making the archeologist's work and time far more productive.
Take, for example, the second 1981 flight of the Space Shuttle Challenger. During that mission, a powerful, experimental radar was pointed at a lifeless stretch of desert in Egypt called the Selima Sand Sheet (part of the Sahara Desert). To everyone's surprise, the radar penetrated through the sand to the harder rock beneath. On the surface, there is a little indication that Africa's Sahara Desert was never anything but a desert. When the archeologists studied the radar images, they saw what seemed to be impossible: there was sand-buried landscape. that was shaped by flowing water; traces of ancient riverbeds appeared to be over nine miles wide, far wider than most sections of the present-day Nile River. Today, the area is one of the hottest, driest desert in the world.
Archeologists dug pits along the old river banks and found clues to the past: stream-rounded pebbles (鹅卵石), Stone-Age axes, broken ostrich (鸵鸟) eggshells, and the shells of land snails. The archeologists were quite pleased with these findings. For years, they'd been finding stone axes scattered through, the-desert, and couldn't understand why. Now we know that early humans were living on the banks of old rivers, and left their beautiful tools behind. Some are so sharp that you could shave with them.
More recently, Landsat 4, a special Earth-mapping satellite, aided in the discovery of ancient Mayan ruins in Mexico. Landsat can, with the help of false-color imagery, "see through" much of the area. Armed with these maps, a five-person expedition took to the air in a helicopter.
By the end of the second day, the team found a stretch of walled fields that expedition members said look like "old New England fences". They just go on, non-stop, for 40 miles. Later in the week, an ancient village was pinpointed, as was the "lost" city of Oxpemul, once found in the early 1930's but quickly reclaimed by the jungle. The findings made them able to map the extent of the Mayan civilization in about five days. Working on foot, it would, have taken at least 100 years.
With the help of the space-shuttle-carried radar, archeologists found
A．a new stretch of the Sahara desert.
B．traces of ancient riverbeds under the Sahara Desert.
C．some traditional archeological tools in the Sahara Desert.
D．a mountain beneath the Sahara Desert.
第5题
Hippocrates pointed that human well-being is influenced by a lot of factors.
A．Right
B．Wrong
C．Not mentioned
第6题
[ A] pointed
[ B ] replied
[ C ] turned
[ D] introduced
第8题
Hippocrates pointed that human well-being is influenced by a lot of factors.
A. Right
B. Wrong
C. Not mentioned
第9题
A peculiarly pointed chin is his most memorable facial ________.
A) mark
B) feature
C) trace
D) appearance
