完形填空 先通读下面的短文，掌握其大意，然后在每小题所给的四个选项中，选出可以填入空白处的最佳选项。 Mexican people have a tradition of greeting each other with handshakes and kisses on the cheek（脸颊. But recently, government officials asked people to 1 this. They have also closed schools and museums, and advised people to stay at home. This is to stop people from 2 an infectious disease (传染病), swine flu (猪流感). The disease has spread over the country. It has killed 159 people and caused 4,000 to become sick 3 . What is swine flu? Swine flu is a disease that causes respiratory (呼吸的) illness in pigs. It spreads to people in two ways. People catch the virus after being with infected(被感染的)pigs, or they get it from an infected 4 . The disease spreads in the same way 5 human flu, through coughs and sneezes and then touching the nose or mouth. However, it 6 be spread by eating pork. People who have caught swine flu will have a fever, a cough, a sore throat and body aches. In most cases, the infection makes people unwell but their lives will not be 7. A few governments around the world have advised their citizens not to visit 8. Some countries have begun checking air travelers for the disease and have set up quarantines (隔离) for people who might be infected. Russia, China and other countries have banned (禁止) buying pork from Mexico, 9 the flu cannot be caught by eating the meat. Health experts advise people to wash their hands frequently(频繁地), to cover coughs and sneezes and to stay at home if they feel 10.