这是G3教材中的一篇有关蝴蝶生活的科普实验性的文章，课文需要掌握的关键词汇这里有7个——
特别设计：同样给出的是一篇短文，把这七个词汇集中在这篇短文里，让学生在理解的基础上选择词汇——
关键词汇：1）capture 2)enclosure 3)protect 4)supply 5)disappear 6)harming 7)involved
A certain kind of toad lives in the grassy prairie. The toads used to be plentiful, but not anymore. Every year, more of them seemed to ________.
Some scientists wanted to konw what was ________ the tosds. They decided to get ________ . If they could learn morn, they might be able to ________ the toads.
The scientists built a large ________ . They made sure there would be enough food, with a good ________ of insects for the toads to eat. The scientists were able to ________ some toads and study them. Soon they learned what was causing the toad population to grow smaller.
Answer Key:
A certain kind of toad lives in the grassy prairie. The toads used to be plentiful, but not anymore. Every year, more of them seemed to
disappear .
Some scientists wanted to konw what was
harming the tosds. They decided to get
involved . If they could learn morn, they might be able to
protect the toads.
The scientists built a large
enclosure . They made sure there would be enough food, with a good
supply of insects for the toads to eat. The scientists were able to
capture some toads and study them. Soon they learned what was causing the toad population to grow smaller..
