1 . There's a loud bang, and then it starts: A battery of an electric car is on fire in the test tunnel. A video of the test impressively shows the energy stored in such batteries: meter-long flames flee in disorder and produce enormous amounts of thick, black smoke. The visibility in the previously brightly lit tunnel section quickly approaches zero. After a few minutes, ashes have spread throughout the room.

"In our experiment we were considering in particular private and public operators of small and large underground or multi-storey car parks," says project leader Lars Derek Mellert,"all these existing underground structures are being used to an increasing extent by electric cars. And the operators ask themselves: “    1    ?"But until now there has been hardly any meaningful technical literature, let alone practical experience for such a case. So Mellert developed three test scenarios（场景）, the results of which were published in a final report in August 2020.

“    2    . Besides, they are possibly fatal regardless of the type of drive or energy storage system." says the final report. The primary objective has to be to get everyone out of the danger zone as quickly as possible. The highly poisonous hydrofluoric（氢氟）acid has often been discussed as a particular danger in burning batteries.    3    . The real problem, however, is the extinguishing and cooling water that is produced when fighting such a fire and storing a burnt-out battery in a water basin. The analyses showed that some chemical substances in the extinguishing water goes beyond the limit values for industrial wastewater by a factor of 70; the cooling water is even up to 100-times above limit values.

    4    Firefighters know that the battery of an electric car is impossible to extinguish and that it can only be cooled with large amounts of water. But this is already known to the specialists and is being practiced.

A．The pollutants emitted by a burning vehicle have always been dangerous

B．What on earth causes Lithium batteries to catch fire

C．Even the fire brigades do not have to learn anything new on the basis of the tests

D．The acid can possibly result in death, while its effects may delay after exposure

E．But in the three tests in the tunnel the concentrations remained far below critical levels

F．What will happen if such a car catches fire

2 . 听下面一段较长对话，回答以下小题。1.

A．It happened in the southern part of India.	B．It killed more than 500 people in Bombay.
C．It caused a landslide near the railway.	D．It wasn’t linked to local armed conflicts.

2.

A．Two trains hitting each other head-on.	B．The misfunctioning signalling system.
C．A cow staying on the railway line.	D．A coach going through the crossing.

3.

A．Reporting an accident to the newspaper.	B．Detailing the injuries in an accident.
C．Finding out the cause of a train crash.	D．Requiring financial support from the office.

3 . SOUTH PARIS, Maine For eight students in the Wilderness Leadership class at Oxford Hills High School, a three-day weekend hike in the White Mountain National Forest sounded like a fun, challenging course requirement.

But when a storm dumped up to 3 feet of snow on western Maine, a harsh learning experience turned into a crash course in winter survival.

Reported missing from their scheduled meeting place in Gilead at 5:30 p.m. Sunday, the eight students and two teachers were not found until 11 a.m. yesterday [Monday], after a pilot spotted the group moving in rugged snow-blanketed area. The discovery followed an unsuccessful ground search by volunteers on snowshoes.

After the group was reported missing Sunday, volunteers hiked 3 miles into the woods to look for the students. The five-hour effort turned up nothing and the decision was made to wait until yesterday morning to also canvass the area by air.

A Maine Warden Service pilot lifted off and spotted the group close to their intended trail at about 11 a.m. Strong airflow prevented him from descending toward the hikers but the group clearly recognized the plane as part of a search team.

“They waved at the plane. They laid down, spread out, and waved,” said Mark Latti, a spokesman for the Maine Warden Service. “The pilot then guided a search party into their location.”

1. Before yesterday, the three-day weekend hike was supposed to be a _____.

A．fun and relaxing excursion	B．ridiculous course requirement
C．crash course for wilderness survival	D．challenging learning experience

2. The underlined word “canvass” in paragraph 4 probably means _____.

A．intrude

B．search

C．harvest

D．exploit

3. Which of the following is in the correct order?
① The group was reported missing.
② A pilot spotted the group in the snow-blanket area.
③ A rescue team arrived at the site of the accident.
④ A volunteer search group set out to look for the students.
⑤ The hikers waved to make themselves discovered.

A．①②④⑤③	B．①④⑤②③
C．①④②⑤③	D．①③④②⑤

4. Which of the following statements is TRUE?

A．The volunteers gave up the search at last because of the airflow.

B．The pilot succeeded in landing besides the hikers.

C．The hikers almost stuck to their planned route in spite of the heavy snow.

D．The search party went into the woods by air, and saved the students out.