阅读理解
阅读下列短文,从每题所给的A、B、C和D项中,选出最佳选项。
A
If you travel to a new exhibit at the San Francisco Conservatory of Flowers, you will have chances to see some meateating plants. Take bladderworts, a kind of such plant, for example. They appear so small and grow in a quiet pond. But these are the fastestknown killers of the plant kingdom, able to capture a small insect in 1/50 of a second using a trap door!
Once the trap door closes on the victim, 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.
Meateating 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 needs over thousands of years.North America has more such plants than any other continent.