A
Last summer I went through a training program and became a literacy volunteer（扫盲志愿者）. The training I received, thoug

B
As you move around your home, take a good look at the things

Aristotle summed up the four qualities of money some 2，000 years ago．It must be lasting and easy to recognize，to divide，and to carry about．When we think of money today，we picture it either as round，flat pieces of metal which we call coins or as printed paper notes．But there are still parts of the world today where coins and notes

There is a story of a country where the rate of inflation（通货膨胀）is so high that clever people pay for a taxi ride before the trip instead of after．The story may or may not be true．Inflation was almost that serious in Germany from July，1920 until December，1923．Prices went up so fast that by the end of 1923 they were 50 billion percent high

"What part of the states do you come from?"
"I'm not American. I'm Canadian."
This is a mistake that Europeans often make. Many Americans, too, admit that it takes them a while to tell if it's an American talking or a Cana

Time talks. It speaks more plainly than words. Time communicates in many ways.
Consider the different parts of the day, for example. The time of the day when something is done can give a special meaning to the event. Factory ma

Bright comets are spectacular sights，but they are not often seen by the human eye．
In 1682，the English astronomer Edmund Halley identified and studied the motion of a bright comet．First，he figured out the comet's orbit，or path，around the sun．T

“Who shot her？”cried Rogers as he rushed into the hospital three minutes after his ex-wife died from a bullet through her head．
“Just a minute，”Professor Fordney said．“I'd like to ask you a few questions．．．routine ，you know．Although divorced for the pa

The Americans and Russians were ready to fight a war. They each had the power to destroy the other. This power was carried in the missiles (导弹) that each country had aimed at the other. This struggle was called “The Cold War”. Some of the missiles were buried in the ground, ready to fire at a moment's notice. Others were carried by air-p

Singapore leads many other countries with its sound legal system and outstanding economic growth. In a sense, many people in China look up to it as a materialization of their dream of utopia (乌托邦) guided ideally by traditional Chinese values aided with modern Western management and technology.
    Such a condition wou

C
    Th

D
Have you ever got stuck with unwanted courses or a class sch

In the winter，skiing is traditionally a popular sport for people of all ages who like to be outdoors．People take their ski equipment and head for the mountains．But these days，skiers are not the only people on the hills．Snowboarders are joining the skiers for some winter thrills．Snowboarding is fun and exciting．It is like surfing on the s

There is a very simple way of measuring the height of a water-tower，which we cannot measure by climbing．
    Suppose，for example，that we wish to find out the height of the water-tower，AB，in a factory．We first of all go to where the water-tower is standing and measure a distance of，say，90 feet from it，in a straight line

Jim wrote out a prescription for Mrs Green. “There you are,”he said. "That should cure you. And how is Susan getting on?" Susan was Mrs Green's daughter. "She has just qualified as a teacher," Mrs Green said. "Her ambition is to find a teaching appointment abroad. I'm afraid I don't app