A deadly disease has affected these animals.

A:contagious B:serious C:fatal D:worrying

A {{U}}deadly{{/U}} disease has affected these animals.

A:contagious B:serious C:fatal D:worrying

A hundred years ago, life expectancy in developed countries was about 47 in the early 21st century, men in the United States and the United Kingdom can expect to live to about 74. Women to about 80, and these (51) are rising all the time. What has brought (52) these changes When we look at the life (53) of people 100 years ago, we need to look at the greatest (54) of the time. In the early 20th century, these were the acute and often (55) infectious diseases such as smallpox. Many children died Very young from these diseases and others, and the weak and elderly were always at risk.
In the (56) world these diseases are far (57) today, and in some cases have almost disappeared. A number of (58) have led to this: improvements in sanitation and hygiene, the discovery and use of antibiotics, which (59) bacterial diseases much less dangerous, and vaccinations (60) common diseases. (61) , people’s general health has improved with improvements in our general environment: cleaner air, better means of preserving food, better and warmer housing, and better understanding of nutrition.
Genetically, we should all be able to live to about 85 but (62) people do live longer today, there are still some big killers around that are preventing US from consistently reaching that age. The problems that affect people today are the more chronic illnesses, such as heart disease and strokes, and those (63) by viruses, such as influenza and AIDS. Of course, cancer is a huge killer as well. In most cases these diseases affect (64) people, but there are worrying trends in the developed world with problems such as obesity (65) more heart disease and illnesses such as diabetes at younger ages.
The killers today can be classed as "lifestyle diseases", which means that it may be possible to halt their progress.

A:more deadly B:deadly C:less deadly D:fatal

下面有3篇短文，每篇短文后有5道题。请根据短文回答其后面的问题，为每题确定1个最佳答案。
第一篇

Heat and Health
Extremely hot weather is common in many parts of the world. Although hot weather just makes most people hot, it can cause medical problems--and death.
Health experts say that since the year 1900, extremely hot weather has killed more people in the United States than any other natural event. One year--the unusually hot summer of 1980--heat caused about 1,700 deaths in the United States. In 1995, more than 600 people died in a similar heat wave in one city--Chicago.
To measure extreme heat, government weather experts have developed the Mean Heat Index. It measures the average of how hot it is felt all day on an extremely hot day. Experts say it is the total heat of a hot day or several hot days that can affect health. Several hot days are considered a heat wave. Experts say heat waves often become deadly when the nighttime temperature does not drop much from the highest daytime temperature.
The most common medical problem caused by hot weather is heat stress. Usually, it also is the least severe. For most people, the only result of heat stress is muscle pain. The pain is a" warning that the body is becoming too hot. Doctors say drinking water will help the pain disappear after the body again has the right amounts of water and salt. For some people, however, the result is much more serious.
For example, doctors say some people face a greatly increased danger from heat stress. These people have a weak or damaged heart, high blood pressure, or other problems of the blood system. Severe heat can help cause a heart attack or stroke. Health experts say this is the most common cause of death linked to hot weather.

For people who are in extremely poor health, heat can be（）

A:deadly B:painful C:helpful D:stressful

A deadly disease has affected these animals.

A:contagious B:serious C:fatal D:worrying

A deadly disease has affected these animals.

A:contagious B:serious C:fatal D:worrying

A {{U}}deadly{{/U}} disease has affected these animals.

A:contagious B:serious C:fatal D:worrying