The system produces enough electricity to allow the temperature and humidity sensors to wirelessly send out signals four times a day, or immediately if there’s a fire. Each signal spreads from one sensor to another, until it reaches an existing weather station that sends the data by satellite to a forestry command center in Boise, Idaho.

　　Scientists have long known that trees can produce extremely small amounts of electricity. But no one knew exactly how the energy was produced or how to take advantage of the power.

　　28．What are the disadvantages of the remote automatic weather stations?

　　a. They cost too much.

　　b. They are of poor quality.

　　c. They are not enough.

　　d. They can’t reach remote places.

　　A．a, bB．b, dC．a, cD．b, c

　　29．Which of the following is the best sentence to fill in the blank?

　　A．Far water does not put out near fire.

　　B．All rivers run into sea.

　　C．Many a little makes a mickle.

　　D．It never rains but it pours.

　　30．What Shuguang Zhang said in Paragraph 4 means that ________.

　　A．a single tree is enough to generate much power

　　B．the power from the tree can’t be stored

　　C．trees can generate enough power for our life

　　D．a tree can produce the electricity to meet the needs of a sensor

【2017届高考英语一轮复习课时作业9：Unit 3《Back to the past》（牛津译林版必修3湖南专用）】相关文章：

★ 北京市2014高考英语一轮复习 练习手册（40）选修8 Unit 5 Meeting your ancestors（含解析）新人教版

★ 2014届高考英语一轮复习课时作业(十四)必修3Module 2《Developing and Developed Countries》（外研版）

★ 【三维设计】2017届高考英语（江苏专用）二轮复习课件：必修1 Unit 3《Looking good feeling good》

★ 2017届高考英语二轮复习书面表达限时测验：7（含解析）

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 10 A卷 Word版含解析

★ 2017届高考英语二轮复习大题冲关秘籍短文改错：名校模拟（含解析）

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 11 A卷 Word版含解析

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 6 B卷 Word版含解析

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修7 unit4《Sharing》

★ 2014届高考英语一轮复习课时作业(九)必修2Module 3《Music》（外研版）