In her book Ms. Carson said that these pesticides would harm much more than   insects. She explained that these poisons would pollute the environment. “Even if their effects are not immediately observable, they remain for years in the water and the soil, and they become part of the food eaten by animals and humans. Besides, after a time, insects develop immunity to pesticides," she said.

Recent studies have shown that pesticides can affect human brainwave activity and cause loss of memory and inability to concentrate. We should still remember

Rachel Carson’s words, “I think we are challenged as we have never been challenged before to prove our mastery, not of nature, but of ourselves.”

 Silent Spring is a book that__________

A. aims to raise people’s environmental awareness

B. stresses the importance of the cycle of nature

C. describes the author' s childhood experiences

D. asks people to enjoy the beauty of spring

The underlined word “distressed" in Paragraph 3 probably means________

A. curious  B. humorous   c. excited   D. worried

According to the text, Rachel Carson________

A. became world-famous due to Silent Spring

B. warned against the use of chemicals to kill insects

C. had a good knowledge of the planets in the universe

D. created a system for improving human brainwave activity