the|四六级 | 四六级备考 | 2016年12月英语四级听力真题及答案：第2套( 三 ) heard|Sectio

Questions 1 and 2 are based on the news report you have just heard.

1. Why does New York State want to turn off Niagara Falls?
2. What did people find when Niagara Falls were shut off in 1969?

News Report Two
The Tunisian government said Monday that 45 people have been killed after gunmen attacked a town near the border with Libya. The Interior and Defense ministries said that the Tunisian government has closed its two border crossings with Libya because of the attack. The Tunisian military has sent reinforcements and helicopters to the area, and authorities have been hunting several attackers who were still at large. The violence came amid increasing international concern about Islamic State extremists in Libya. Officials of the Tunisian government are especially worried after dozens of tourists were killed in the attacks in Tunisia last year. Defense Minister Farhat Horchani said last week that German and American security experts were expected to come to help Tunisia devise a new electronic video supervision system on its border with Libya. Tunisia was targeted last year by three attacks that left 70 people dead and were claimed by Islamic State.
Questions 3 and 4 are based on the news report you have just heard.

3. What did the Tunisian government do after the gunmen's attack?
4. What were German and American security experts expected to do in Tunisia?

News Report Three
Three university students in Santiago, Chile, have developed a plant-powered device to charge their mobile phones. The three engineering students got the idea for the device while sitting in their school's courtyard. Their invention is a small biological circuit they call E-Kaia. It captures the energy which plants produce during photosynthesis— a process of converting sunlight into energy. A plant uses only a small part of the energy produced by that process. The rest goes into the soil. E-Kaia collects that energy. The device plugs into the ground and then into a mobile phone. The E-Kaia solved two problems for the engineering students. They needed an idea for a class project. They also needed an outlet to plug in their phones. One of the student inventors, Camila Rupcich, says the device changes the energy released from the plant into low-level power to charge phones. The E-Kaia is able to fully recharge a mobile phone in less than two hours.
Questions 5 to 7 are based on the news report you have just heard.

5. What did the three university students invent?
6. When did they get the idea for the invention?
7. What does the speaker say about the invention?

Section B
Directions:
In this section, you will hear two long conversations. At the end of each conversation, you will hear four questions. Both the conversation and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.