题目内容：

Malaysia Airlines Flight MH370, after its shocking disappearance, has caught the attention of millions around the world as the search for the airplane and its passengers and crew continues. What happened to the flight’s 239 passengers and crew after the plane left Kuala Lumpur on Saturday? It is becoming an increasingly desperate question as the days pass.

But it’s hardly the first mystery of its kind. Here are some half-solved and unsolved airline mysteries that kept investigators clueless for years.

Air France Flight 447: An Airbus A330 flight from Rio de Janeiro to Paris plunged into the Atlantic Ocean in 2009, killing all 228 passengers and crew on board. But it took a full five days for search and rescue teams to find the wreckage（残骸）and another three years for investigators to report that ice crystals had caused the autopilot (自动驾驶仪) to disconnect. The bodies of 74 passengers remain unrecovered.

Amelia Earhart: Top pilot Amelia Earhart disappeared in her twin-engine monoplane Electra over the Pacific Ocean in 1937 in an attempt to travel around the globe. No sign of her plane was ever found even after a multi-million dollar search effort, and Earhart was officially declared dead in 1939.

Flying Tiger Line Flight 739: A U.S. military flight left Guam in 1962 with more 90 personnel headed for the Philippines, but it never arrived. The pilots never issued a distress call, and 1,300 people involved in the U.S. military search never found any sign of wreckage.

British South American Airways: It took more than 50 years to find any trace of the 11 people aboard a 1947 flight that disappeared in the Andes Mountains. A pair of Argentineans rock climbers discovered engine wreckage in the Andes in 1998, and an army expedition later found human remains as well.

Uruguayan Air Force Flight 571: A flight headed to Santiago, Chile carrying 45 passengers and crew crashed into the Andes Mountains in poor weather in 1972, killing twelve people. In the meantime, eight were killed in an avalanche (雪崩) that hit the plane’s wreckage where they were taking shelter, and the rest stayed alive by eating the flesh of the dead before they were finally found more than two months after disappearing out of the sky.

1.The underlined word “plunged” in Paragraph 3 is closest in meaning to _____.

A. jumped      B. broke      C. dived       D. flew

2.What can we learn from Uruguayan Air Force Flight 571? _____.

A. 12 people were lost until now.

B. 25 people were rescued immediately.

C. The rest who stayed alive killed 8 people.

D. 8 were killed by a fall of a large mass of snow down a mountainside.

3.From the passage, what could have led to British South American Airways crash?

A. The bad weather.           B. Not mentioned.

C. The ice crystals.          D. The lightning.

4.Which of the following is TRUE according to the passage? _____.

A. Earhart was declared dead by the local government two years later.

B. The bodies of Flight 447 had all been found after three years.

C. Two Argentineans rock climbers discovered the dead in the Andes.

D. Malaysia Airlines Flight MH370 was regarded as the largest air crash.