问题 单项选择题

“未发现具有已接收讯号特征的电波源”这句话的意思是( )。

A.不知道已经接收到的讯号有没有电波源

B.已经接收到讯号但不能确定其电波源

C.不能确定电波发出的源头已经接收到了讯号

D.已接收到讯号但没有发现电波源的特征

答案

参考答案:B

问答题 简答题
阅读理解

Melissa Poe was 9 years old when she began a campaign for a cleaner environment by writing a letter to the then President Bush. Through her on efforts, her letter was reproduced on over 250 donated billboards (广告牌)across the country.

The response to her request for help was so huge that Poe established Kids For A Cleaner Environment (Kids F.A.C.E.) in 1989. There are now 300,000 members of Kids F.A.C.E. worldwide and it is the world’s largest youth environmental organization.

Poe has also asked the National Park Service to carry out a “Children’s Forest” project in every national park. In 1992, she was invited one of only six children in the world to speak at the Earth Summit in Brazil as part of the Voices of the future Program. In 1993, she was given a Caring Award for her efforts by the Caring Institute.

Since the organization started, Kids F.A.C.E. members have distributed and planted over 1 million trees! Ongoing tree-planting projects include Kids’ Yards — the creation of backyard wildlife habitats (栖息地) and now Kids F.A.C.E. is involved in the exciting Odyssey, which is a great way to start helping.

“We try to tell kids that it’s not OK to be lazy,” she explains, “You need to start being a response, environmentally friendly person now, right now, before you become a resource-sucking adult.”

72. Kids F.A.C.E. is __________.

A. a program to help students with writing

B. a project of litter recycling

C. a campaign launched by President Bush

D. a club of environmental protection

73. What can we learn about Poe?

A. She was awarded a prize in Brazil.

B. She donated billboards across the country.

C. She got positive responses for her efforts.

D. She joined the National Park Service.

74. Kid’s Yards is ____________.

A. established in national park

B. started to protect wildlife

C. a wildlife-raising project

D. an environment park for kids

75. Which of the following can be inferred from the text?

A. Adults are resources –sucking people.

B. Poe sought help from a youth organization

C. Kids F.A.C.E. members are from the U.S.

D. Kids are urged to save natural resources.