单项选择题

An epidemic of swine flu has recently developed in Mexico and the United States, says the CDC. Swine flu has killed many people, and the outbreak has features that suggest it could become a global pandemic. A pandemic is an epidemic that spreads around the whole world. Pandemics also often cause more severe disease than epidemics.
Which of the following statements is true about a pandemic

A. It is the same as an epidemic.
B. It always follows an epidemic.
C. It is widespread and serious.
D. It kills all people who are infecte
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单项选择题
Nowadays nearly everyone has suffered from a bad attack of forgetfulness when a password is needed. The company computer, the home computer, banking and ATM machines, Websites, car and home security systems. The list goes on. It does not take long to accumulate a dozen or more passwords. Scribbling them down on slips of paper or simply using the same password for anything and everything is how most people cope with the overload. The negative aspect of this is that either way makes it easier for hackers to invade computer privacy. Using the same password for everything may result in
A. the user’s forgetfulness.
B. the user’s overload.
C. the loss of banking accounts.
D. the theft of privacy.
单项选择题
In order to limit the damage and to prevent some of the suffering resulting from earthquakes, scientists are working on ways to enable accurate prediction, Special instruments are used to help people record, for example, shaking of the earth. Scientist are trying to find methods that will enable them to indicate the exact time, location and size of an earthquake. Certain phenomena have been observed which are believed to be the signs of imminent(即将发生的) earthquakes. These include strange behaviours of some animals, the changes in the content of mineral water, etc. The magnetic properties of rocks may also display special pattern before major earthquakes happen. Signs of imminent earthquakes include all the following BUT
A. strange behaviours of animals.
B. changes in the content of mineral water.
C. the magnetic properties of rocks.
D. dramatic change in climat
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