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题型:阅读理解-阅读单选 难度:0.65 引用次数:270 题号:10446154

Some plants get so hungry that they eat flies, spiders, and even small frogs. What’s more amazing is that these plants occur naturally (in special environments) in every state. In fact, they’re found on every continent except Antarctica.

You’ve probably seen a Venus’ flytrap. It’s often sold in museum gift stores, department stores, and even supermarkets. A small plant, it grows 6 to 8 inches tall in a container. At the end of its stalks (茎) are specially modified leaves that act like traps. Inside each trap is a lining of tiny trigger hairs. When an insect lands on them, the trap suddenly shuts. Over the course of a week or so, the plant feeds on its catch.

The Venus flytrap is just one of more than 500 species of meat-eating plants, says Barry Meyers-Rice, the editor of the International carnivorous (食肉的) Plant Society’ s Newsletter. Note: Despite any science-fiction stories you might have read, no meat-eating plant does any danger to humans.

Dr. Meyers-Rice says a plant is meat-eating, only if it does all four of the following “attract, kill, digest, and absorb” some from of insects, including flies, butterflies, and moths. Meat-eating plants look and act like other green plants -- well, most of the time.

All green plants make sugar through a process called photosynthesis (光合作用). Plants use the sugar to make food. What makes “meat-eating” plants different is their bug-catching leaves. They need insects for one reason: nitrogen. Nitrogen is a nutrient that they can’t obtain any other way. While almost all green plants on our planet get nitrogen from the soil, “meat-eating” plants can’t. They live in places where nutrients are hard or almost impossible to get from the soil because of its acidity. So they’ve come to rely on getting nitrogen from insects and small animals. In fact, nutrient-rich soil is poisonous to “meat-eating” plants. Never fertilize them! But don’t worry, either, if they never seem to catch any insects. They can survive, but they’ll grow very slowly.

1. According to the passage, carnivorous plants ________.
A.only grow in wild fieldB.are rare to see
C.are as common as fliesD.cannot grow on Antarctica
2. Venus flytrap preys on insects with ________.
A.its numerous long an thin stalksB.a container where it grows
C.its insect-catching leavesD.the lining of tiny trigger hairs
3. We can conclude from the third paragraph that ________.
A.carnivorous plants are dangerous
B.carnivorous plants are fictional
C.carnivorous plants occasionally eat book
D.carnivorous plants are harmless to humans
4. In the eyes of the author, which of the following statements is TRUE?
A.Carnivorous plants cannot grow in acid soil
B.Carnivorous plants can grow in nutrient-poor soil
C.Carnivorous plants will die if they cannot catch any insects
D.Carnivorous plants can get nitrogen from nutrient-rich soil

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【推荐1】Crocodiles today look very similar to ones from 200 million years ago. There are also very few species alive today---just 25. Other animals such as lizards(蜥蜴)and birds have achieved a diversity of many thousands of species in the same amount of time or less.

Prehistory also saw types of crocodile we don't see today, including giants as big as dinosaurs, plant-eaters, fast runners and snake-like forms that lived in the sea. The rate of their evolution is generally slow, but occasionally they evolve more quickly because the environment has changed. In particular, their evolution speeds up when the climate is warmer, and their body size increases.

The body size of crocodiles is important because it interacts with how fast animals grow, how much food they need, how big their populations are and how likely they are to become extinct. The limited diversity of crocodiles and their apparent lack of evolution is a result of a slow evolutionary rate. It seems the crocodiles arrived at a body plan that was very efficient and perfect enough that they didn't need to change it in order to survive. This perfection could be one explanation why crocodiles survived Cretaceous period(白垩纪), in which the dinosaurs died out.

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1. What influenced the evolution of crocodiles most?
A.Their number.B.The climate.C.Their habits.D.Food resources.
2. Why did crocodiles go slowly in evolution?
A.As a result of their good appetite.
B.Because of their perfect body type.
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D.Due to their limited ability to reproduce.
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