Question

Some plants get so hungry 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 (捕蝾草) .It's often sold in museum gift stores,de?partment stores,and even supermarkets. A small plant,it grows 6 to 8 inches tall in a contain?er. At the end of its stalks (茎) are specially modified leaves that act like traps. Inside each trap is a lining of tiny trigger (触发) hairs. When an insect lands on them,the trap suddenly shut. 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 meateating plants,says Barry Meyers-Rice,the editor of the International Carnivorous Plant Society's Newsletter. Note: Despite any sciencefiction stories (科幻小说) you might have read,no meateating plant does any danger to humans.

Dr. Meyers-Rice says a plant is meateating,only if it does all four of the following： " at?tract,kill,digest,and absorb" some form of insects,including flies,butterflies,and moths. Meateating 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 " meateating" plants different is their bugcatching leaves. They need insects for one reason;nitrogen (氮) .Nitrogen is a nutrient that they can't obtain by any other way. Why?

Almost all green plants on our planet get nitrogen from the soil. " Meateating" plants can't. They live in places where nutrients are hard or almost impossible to get from the soil be?cause of its acidity (酸度) .So they've come to rely on getting nitrogen from insects and small animals. In fact,nutrientrich soil is poisonous to "meateating" plants. Never fertilize (施肥) them!But don't worry,either,if they never seem to catch any insects. They can survive,but they'll grow very slowly.

(   ) 1. What is a Venus flytrap?

   A. It is a small plant which grows in a container.

   B. It grows 6-8 inches tall.

   C. It can attract,kill,digest and absorb some form of insects.

   D. It is a kind of plant which gets hungry easily.

(   ) 2. What can we learn from the passage?

   A. It is the bugcatch leaves make Venus flytrap different from other plants.

   B. All green plants get nitrogen from the soil.

   C. " Meateating" plants are found on every continent.

   D. Some "meateating" plants in the world do danger to humans.

(   ) 3. Why does the writer say "Never fertilize ' meateating' plants?"

   A. Though growing slowly,they don't need nitrogen.

   B. Probably because the source of nitrogen is adequate.

   C. Simply because the nutrientrich soil will do harm to them.

   D. Perhaps they can get fertilize by themselves.

(   ) 4. Which of the following might be the best title for the text?

   A. Meateating Plant Does No Danger to Humans

   B. Let These Plants Swat (重击) the Bugs for You

   C. No Need to Fertilize Meateating Plants

   D. No Insects,No "Meateating" Plants

Answer 1

CACB

有些植物捕获小昆虫为自身增加养分。

1. C细节理解题。第四段有详细表述。

2. A推理判断题。其他三项都是错的。

3. C细节理解题。

4. B主旨大意题。虽然没有直接表述,B项从另一个角度说明一些植物能够帮助人类摆脱恼人的小昆虫。其他选择不能代表整篇文章的主题。