How are deserts formed? A A desert refers to a barren section of land, mainly in arid and semi-arid areas, where there is almost no precipitation, and the environment is hostile for any creature to …
Many parts of the world, which once had large populations and produced plenty of crops, have become deserts. 世界上很多地区一度人口众多,种植大量的农作物;现在,这些地区已经变成了沙漠。四、表示人口的\"多\"或\"少\",不用\"much\"或\"little\",而要用\"large\"或\"small\"。例如:...
and the Arctic Ocean. Oceans cover about three-quarters of the earth's surface.不是所有的陆地都适合人们。(5) Some land is too dry. The land is called desert. Deserts cover one-fifth of the earth's surface. 1. How many people were there in the world in 2000?
The stunning city of Petra in Jordan was built by the Nabataeans with staggering sums from the luxury trade. Now the discovery of a faraway submerged altar temple shows the extent of its reach.
右上腹疼痛半年，加重伴上腹部包块1个月。半年前无明显诱因出现右上腹钝痛，为持续性，有时向右肩背部放射。近1个月来，右上腹痛加重，自觉右上腹饱满，有包块，伴腹胀、食欲缺乏、恶心，无呕吐、腹泻，偶有发热(体温最高38．1℃)。患者发病来，大小便正常，体重下降约5公斤。既往有乙型肝炎病史15年，否认...
2. Kangaroos are found only in Australia. Kangaroos are marsupials, which means that they carry their young in a pouch. There are many different species of kangaroos, ranging in size from the tiny musky rat kangaroo to the large red kangaroo. ...
根据第一段“There’re children in many different parts of the world who, every day, have to go on a difficult journey to get to school. They travel for kilometers on foot, or by boat, bicycle, donkey (驴) or train. They cross deserts (沙漠), mountains, rivers, snow and ice.”可知...
But not always—there are children in many different places of the world. Every day they have to go on a difficult way to go to school. They travel for a long way. They go across (穿过) deserts, mountains, rivers, snow and ice. For example, The children in Alaska go to school ...
The old trade routes of the silk road give travellers endless options to explore central Asia, from lake-scattered mountain plateaus to ornate mausoleum complexes and lively cities packed with soviet architecture.
As Earth's population creeps toward 8 billion, the amount of arable land on the planet becomes more crucial for the survival of its growing population. Many factors contribute to the crop-worthiness of land, including local climate, soil type, annual rai