Old-fashioned phones matter when wireless networks _____in disasters.

A．turn down         B．turn out           C．break down        D．break out

A boy of 14 has become the youngest student to win a place at Cambridge University. Arran Fernandez, who was  16 at home by his father, Neil, will 17  a mathematics degree at Fitzwilliam College next month and he hopes to have a career as a research mathematician to 18  the Riemann hypothesis(黎曼猜想) that has confused the brightest minds. It will make him the youngest Cambridge student  19 14-year-old William Pitt the Younger studied there in 1773.
Last night the child genius said: “I am looking forward to going to the  20  . I have started the first-year books  21   and it is all right, not too  22  . I can understand it. I am excited about going to Cambridge,  23  I am used to making records about being the youngest in education. It isn’t the youngest moment that is so important to me--  24  I’m more interested in going to Cambridge than comparing   25  with other people who go there.”
But  26 his age he will not be able to    27  many of the alcohol-fuelled festivities(庆典) traditionally  28  to Freshers’ Week. “I don’t think I’m missing too much fun,” he insisted. “Even if I was 18, I wouldn’t want to go out  29 . ”
Arran,  30   plans to join the bird-watching society instead and go boating while at university, was five when he  31  the youngest person to be  32   a GCSE (General Certificated of Secondary Education), after passing maths. He was offered the   33  to learn at Cambridge in 2010, when he was 14, on the condition he gained an A-level in physics, which he  34  with an A+ grade. Arran had already gained an A grade in further maths last year.
Cambridge also asked him to attend three GCSEs in subjects which were not related to maths and physics to  35   his knowledge. He gained A+s in English literature and French and an A in English language this summer.

                              D

The year is 2094. It has been announced that a comet (彗星) is heading towards the Earth . Most of it will miss our planet , but two pieces will probably hit the southern half of the Earth .

On 17 July , a piece four kilometers wide enters the Earth’s atmosphere (大气层) with a massive explosion . About half of the piece is destroyed , but the remaining part hits the South Atlantic at 200 times the speed of sound . The sea boils and a huge hole is made in the sea bed . Huge waves are created and spread outwards from the hole . The wall of water , a kilometer high , rushes towards southern Africa at 800 kilometers an hour . Cities on the African coast are totally destroyed and millions of people re drowned .

Before the waves reach South America , the second piece of the comet lands in Argentina . Earthquakes and volcanoes are set off in the Andes Mountains . The shock waves move north into California and all around the Pacific Ocean . The cities of Los Angeles , San Francisco and Tokyo are completely destroyed by earthquakes . Millions of people in the southern half of the earth are already dead, but the north won’t escape for long . Because of the explosions , the sun is hidden by clouds of dust , temperatures around the world fall to almost zero .Crops are ruined . The sun won’t be seen again for many years . Wars break out as countries fight for food . A year later , no more than 10 million people remain alive .

Could it really happen ? In fact , it has already happened more than once in the history of the Earth . The dinosaurs were on the Earth for over 160 million years . Then 65 million years ago they suddenly disappeared . Many scientists believe that the Earth was hit by a piece of object in space . The dinosaurs couldn’t live through the cold climate that followed and they died out . Will we meet the same end ?

1.What is mainly described in the passage ?

2.When the first piece hits the South Atlantic , it causes           .

3.Why can’t the northern half of the earth escape for long ?

A quarrel _________, which made him __________ his family.

A. was broken out; break away                                   B. broke out; break away from

C. was broken away; break down                                D. broke down; break out

Knowing how to do in case of fire is important. If a fire break out, what would you do? First, you should warn everyone in the building about the danger. Don’t panic or start shouting. Be calmly and act quickly. Second, you and all the others should be get out of the building. Don’t stop take anything with you. Once you are out of the building, stay out. Do not go back for some reason. Finally, when you are out of the building, calling the fire police. Don’t try to put off the fire yourself. That can be dangerous if you do.