3．How did Dr Seuss help children according to Paragraph 3?

　　A．By asking others to help them in magazines.

　　B．By writing interesting and simple books.

　　C．By changing his old books into simpler ones.

　　D．By giving them books for free.

　　解析：选B　细节理解题。根据第三段最后一句"Dr Seuss decided to write books that were interesting and easy to read."可知B为正确选项。

　　B

　　One of the most unusual flowering plants in the world, the Snowdonia hawkweed (斯诺登水兰), grows only in Snowdonia National Park in northern Wales. The area is rocky and mountainous, and the air is cool and wet. The Snowdonia hawkweed prefers this area. In fact, it grows nowhere else in the world. It is even picky about where it grows in thepark.

　　The Snowdonia hawkweed is about two inches tall with bright yellow flowers. It may not be the most beautiful plant in the world, but it is a favorite snack of sheep.

　　In 1953, the Snowdonia hawkweed disappeared. People feared that the plant was gone forever. They believed that the sheep there had eaten the last few plants. So, the people who ran the park took the sheep away from the area, hoping that the hawkweed might return. In 2002, almost 50 years after it was thought to be extinct,_a group of plant scientists found the yellow flowers in the park - exactly where it had last been seen, and where it had been searched for without success. The hawkweed had returned!

　　To try to prevent the plant from disappearing again, scientists collected seeds (种子) from the plant. Since 2002, the unusual plant has continued to appear in the park.

语篇解读：本文是说明文。文章主要介绍了一种罕见的植物--斯诺登水兰。

　　4．The Snowdonia hawkweed ________.

　　A．is the most beautiful plant in the world

　　B．grows everywhere in northern Wales

　　C．produces the most unusual flowers

　　D．is an extremely unusual plant

　　解析：选D　细节理解题。根据第一段中的"One of the most unusual flowering plants in the world"， "it grows nowhere else in the world"以及"It is even picky about where it grows in the park."不难看出，斯诺登水兰对生长环境很挑剔，只在斯诺登国家公园的某个地方生长，是一种异常罕见的植物。

　　5．What happened to the Snowdonia hawkweed in 1953 ________.

　　A．worried a lot of people

　　B．proved nature is powerful

C．made the park less attractive