[填空题]Substances which are made up of only one kind of atom are called S36 ______ and there are about a hundred of these -- the same S37 ______as there are kinds of atom. These are the substances from which everything else is made. Aristotle taught that there were four elements -- earth, air, fire, and water -- but he was very wrong. None of these is an element in any sense of the word and S38 ______ There is nothing obvious about the appearance of an element which makes it different from other substances, and this explains why man take so long to discover the building blocks from which his world is made, 0nly patient and S39 ______ were able to show that sulfur, copper, and diamond were elements, but air, water, and sand were not. S40 ______ but have to be prepared in the laboratory. For example, the two elements of which water is made are the gases oxygen and hydrogen; oxygen occurs in the air, but it is mixed with a large amount of other gases, and hydrogen is not even present in the

[填空题]Substances which are made up of only one kind of atom are called S36 ______ and there are about a hundred of these -- the same S37 ______as there are kinds of atom. These are the substances from which everything else is made. Aristotle taught that there were four elements -- earth, air, fire, and water -- but he was very wrong. None of these is an element in any sense of the word and S38 ______ There is nothing obvious about the appearance of an element which makes it different from other substances, and this explains why man take so long to discover the building blocks from which his world is made, 0nly patient and S39 ______ were able to show that sulfur, copper, and diamond were elements, but air, water, and sand were not. S40 ______ but have to be prepared in the laboratory. For example, the two elements of which water is made are the gases oxygen and hydrogen; oxygen occurs in the air, but it is mixed with a large amount of other gases, and hydrogen is not even present in the

[填空题]The substances which can give athletes an extra and illegal advantage are ______ in the Olympic Games.

[填空题]Only one other word can be made from all the letters of INSATIABLE. Can you find it

[单项选择]

Passage One
The UK is made up of four countries -- England, Scotland, Wales and Northern Ireland -- which have widely differing cultures and languages.
Wales was the first country to fall under English control, in the late 16th-century. The Welsh were never actually defeated by the English. Instead, they realized that unity with their bigger neighbor was the only way to end the almost continuous state of war that existed between the two countries. Since unity, England and Wales have had the same systems of law, education and government.
The situation between Scotland and England was very different. They fought fierce wars for centuries, each invading each other, whenever the situation seemed in their favour. This came to an end in the 17th-century when King James Vi of Scotland inherited the throne(王位) of England, after Queen Elizabeth I died without children. In 1707, Scotland and England were brought together in an Act of Union. This took away muc
A. the different cultures and languages in UK
B. how the four countries fought with each other
C. how the UK came about
D. the history of the UK

[填空题]The author only mentioned one factor that influenced the US - Asia relations.

[填空题]What is the skeleton made up of It is made up of______.

[单项选择]The discovery of the Antarctic not only proved one of the most interesting of all geographical adventures, but created what might be called "the heroic age of Antarctic exploration". By their tremendous heroism, men such as Shakleton, Scott, and Amundsen caused a new continent to emerge from the shadows, and yet that heroic age, little more than a century old, is already passing. Modern science and inventions are revolutionizing the endurance; future journeys into these icy wastes will probably depend on motor vehicles equipped with caterpillar traction rather than on the dogs that earlier discoverers found so invaluable and hardly comparable.
Few realize that this Antarctic continent is almost equal in size to South America, and enormous field of work awaits geographers and prospectors. The coasts of this continent remain to be accurately charted, and the mapping of the whole of the interior presents a formidable task to the cartographers who undertake the work. Once their labors
A. About 100 years ago.
B. In this century.
C. At the beginning of the 19th century. D. In 1798.