If you travel to a new exhibit at the San Francisco greenhouse of Flowers, you will have a chance to see some meat---eating plants. Take bladderworts, a kind of such plant, for example. They appear so small and grow in a quiet pool. But these are the fastest---known killers of the plant kingdom , able to catch a small insect in 1／50 of a second using a trap(陷阱) door!

Once the trap door closes on the animal falling into it, the enzymes(酶)similar to those in the human stomach slowly digest the insect. When dinner is over, the plant opens the trap door and is ready to trap again.

Meat－eating plants grow mostly in wet areas with soil that doesn't offer much food value. In such conditions these amazing plants have developed insect traps to get their nutritional(营养的)needs over thousands of years. North America has more such plants than any other continent.

Generally speaking, the traps may have attractive appearance to fool the eye, like pitcher plants, which get their name because they look like beautiful pitchers ( a container like a bottle) full of honey.

The Asian pitcher plant, for example, has bright colors and an attractive half－closed cover. Curious insects are attracted to come close and take a drink, then fall down the slippery wall to their deaths.

Some of these pitchers are large enough to hold two gallons (7.5 liters). Meat－eating plants only eat people in science movies , but sometimes a bird or other small animals will discover that a pitcher plant isn't a good place to get a drink.

【小题1】From Paragraph 1, we can know that meat-eating plants can ________.

A．catch 50 small insects in a second	B．catch an insect in a short time
C．be found floating on a quiet lake	D．notice an insect in 1/50 of a second

【小题2】What does it mean if the trap door of a meat-eating plant is closed?

A．The plant is fooling insects into taking a drink.

B．The plant is producing honey.

C．The plant is attracting insects to come close.

D．The plant is enjoying a dinner.

【小题3】Meat－eating plants can grow in wet and poor soil because they________.

A．can get nutrition from animals	B．don't need much food value
C．can make the most of such conditions	D．have developed digestive enzymes

【小题4】We learn from the text that meat－eating plants ________.

A．are big and tall	B．like to grow in dry land
C．look bright and beautiful	D．are usually covered with hair