单选题 The seventh-largest US airline, US Airways, Sunday sought protection from its creditors (债权者) under the American bankruptcy (破产) law. The airline will continue operations while it seeks a solution to its financial crisis.
Based in suburban Washington, US Airways is the first major American airline to declare bankruptcy since the September 11 attacks jolted (震撼、震摇) the airline industry. US Airways suffered from a net loss of more than 2 billion dollars last year and has continued to lose money this year. The company employs 40,000 workers and operates 340 airplanes. Its routes are concentrated in the northeast of the United States.
Company management says US Airways has obtained emergency private sector financing, as well as government funds, to assure continuing operations. Not long after September 11, the company laid off 11,000 workers and has been seeking salary concessions (让步) from its pilots and mechanics.
This is the second major bankruptcy to impact the Washington DC area in the past month. In July, the number-two US telecommunications company, WorldCom, declared bankruptcy. WorldCom"s MCI long distance subsidiary, like US Airways, is based in northern Virginia.
US Airways has long been regarded as the most financially vulnerable of the major US airlines. The company has high labor costs and operates in a very competitive market. A recent attempt to merge (与…合并) with United Airlines, which is also financially weak, was rejected as anti-competitive by government regulators.

单选题 Which of the following is NOT the reason for the US Airways" financial crisis according to the passage?

单选题 What has US Airways NOT done to assure continuing operation?

单选题 Which of the following statements is TRUE according to the passage?

单选题 The attempt of US Airways to merge with United Airlines was rejected due to _____.

单选题 What does the word “vulnerable” probably mean?