[填空题]Each year, 225,000 cardiacs in the US died of____________.

[填空题]In the US each year, sudden cardiac death, caused by a heart-rhythm disturbance called ventricular fibrillation results in the deaths of ______.

[单项选择]

Most of us are used to seasons. Each year, spring follows winter, which follows autumn, which follows summer, which follows spring. And winter is colder than summer. But the earth goes through temperature cycles over much longer periods than those that we experience. Between 65,000 and 35,000 years ago, the planet was much colder than it is now. During that time the temperature also changed a lot, with periods of warming and cooling. Ice melted during the warm periods, which made sea levels rise. Water froze again during the cold periods.
(77) A new study from Switzerland sheds light on where ice sheets melted during the iceage. It now seems that the ice melted at both ends of the earth, rather than just in either northern or southern regions.
This surprised the researchers from the University of Bern. (78) Scientists have long assumed that most of the ice that melted was in the Northern hemisphere (半球) during the 30,000-year long ice age. That belie
A. most of the ice melted in the Northern hemisphere
B. most of the ice melted in the Southern hemisphere
C. The North Pole is colder than the South Pole
D. The South Pole is colder than the North Pole

[单项选择]What happens to trees each year
A. Their tings get thinner and thinner.
B. They add a ring of wood.
C. Their rings get darker in color.
D. They become more valuable.

[单项选择]Each year, millions of people in Bangladesh drink ground water that has been polluted by naturally high levels of arsenic poison. Finding safe drinking water in that country can be a problem. However, International Development Enterprises has a low-cost answer. This non-governmental organization has developed technology to harvest rainwater.
People around the world have been harvesting rainwater for centuries. It is a safe, dependable source of drinking water. Unlike ground water, rainwater contains no minerals or salts and is free of chemical treatments. Best of all, it is free.
The rainwater harvesting system created by International Development Enterprises uses pipes to collect water from the tops of buildings. The pipes stretch from the tops of buildings to a two-meter tall storage tank made of metal. At the top of the tank is a so called "first-flush" device made of wire screen. This barrier prevents dirt and leaves in the water from falling inside the tank.
A fitte
A. ground water
B. rainwater
C. drinking water
D. fresh water

[简答题] Over a million people visit Hawaii each year because of its beautiful weather and wonderful scenery! For most of us, Hawaii begins to attract us with golden beaches and golden people. The Hawaiian Islands are one of the most beautiful places on earth. The weather is friendly. The temperature ranges from 60 to 90 degrees all year long. It’’s a little warmer in summer, and a little cooler in winter, but every day is a beach day for somebody. There are no strangers in Paradise(天堂). Perhaps the most beautiful part of Hawaii is the genuine (特有的)warmth of people. We call it the spirit of love. It has allowed a melting pot of cultures from all over the world to find common ground, and a new home, in this most gentle of places. Sun, sand, sea, surf, and somewhere between the blue skies and the palm trees ------ it is no surprising that so many people visit Hawaii each year! QUESTIONS： Hawaii Attract visitors with: golden beaches and (46) Temper

[填空题]Each year, thousands of Chinese middle school students go to study in foreign countries. Recent research shows among 428 middle school students in Shanghai, nearly half of them would like to study abroad.
"Chinese children are eager to go abroad to get a wider view, less academic (学业) competition or even family honor," said Chen Yi, a Chinese writer who has lived in the US for 16 years. "But life in foreign countries can be hard for young people."
"We have to face the culture shock and language problems," said Hong Guang, a Chinese student in London.
However, these are not always the most difficult things to overcome (克服)To most children, controlling themselves when studying alone in a foreign country is a big challenge.
Zhang Jia, a 16-year-old student from Shanghai, entered high school in Melbourne, Australia last October. To his surprise, his teachers there seldom pushed students to study. And usually there wasn’t much homework.
Some of his friend