The atmosphere is a mixture of several gases. There are about ten chemical elements which remain permanently in gaseous form in the atmosphere Under all natural conditions. Of these permanent gases, oxygen makes up about 21 per cent and nitrogen about 78 per cent. 41) _____________________________________________.The amount of water vapor, and its variations in amount and distribution is of extraordinary importance in weather changes. Atmospheric gases hold in suspension great quantities of dust, pollen, smoke, and other impurities which are always present in considerable, but variable amounts.
The atmosphere has no definite upper limits but gradually thins until it becomes imperceptible(难以察觉的). Until recently it was assumed that the air above the first few miles gradually grew thinner and colder at a constant rate. 42)_____________________________________________. Recent studies of the upper atmosphere, currently being conducted by earth satellites and missile probing(探查
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languages. Because of this, the vocabulary of the English language is very
large. It is much larger than almost any other language in the world. Many English words came from Latin, the old language of Rome, and Greek. From Latin we get words like "wine", "us" and "day". From Greek we have words such as "photograph"," Bible" and "ink". Because these two languages are extinct, the words have more often come through other languages such as French, or the German language. There are also words from both Greek and Latin combined— "television", for example, "tele" is Greek for "far" and "vision" comes from Lation meaning "seeing". Many common English words came from other different places. "tea" is from China, "banana" from West Africa, "potato" from the island of Hati(海地), in the West Indies A. English and French B. Roman and Greek C. Latin and Greek D. French and German [简答题]Japan is an unusual mixture of traditional and ultra-modern. This can be confusing for the visitor because, although it looks quite western, Japan is still in many ways very oriental. Whenever you go into a house you must take off your shoes. Sometimes your host will provide you with slippers; if not, you walk round in your socks. A visitor should also expect in more traditional houses, hotels and restaurants to eat kneeling down on the floor on a cushion in front of a low table. It is a good idea to get used to eating with chopsticks but, if you can’t manage, ask for a knife and fork. The Japanese are extremely polite and friendly: you can nearly always find someone who speaks English. In summer the country is very hot and humid so anyone planning a trip then ought to take light, comfortable clothes with them.
The majority of tourists head for Tokyo but you ought not to miss the chance of visiting the old capital cities of Kyoto and Nara. From Tokyo you can get to Kyoto in thre 我来回答: 提交
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