Pollen, a powdery substance, which is produced by flowering plants and contains male reproductive cells, is usually carried from plant to plant by insects or birds, but some plants rely on the wind to carry their pollen. Wind pollination is often seen as being primitive and wasteful in costly...
When I was preparing for my two-week vacation in southern Africa, I realized that the continent would be like nothing I had ever seen. I wanted to explore the streets as well as the savannah; it’s always been my goal to have experiences on vacation that most other tourists fail to fin...
But the idea that the Gypsies should win some kind of special recognition as Europe’s largest continent wide minority, and one with a terrible history of persecution, is catching on. Gypsies have suffered many pogroms over the centuries. In Romania, the country that still has the largest numb...
B.The butter produced by Thomas Moored is better in quality than other famers’ C.Knowledge of the physics of heat plays an important part in inventing a good icebox D.Before 1880, most of the sold ice was used for family use.【小题5】 Without an ice box, farmers had to go to the...
namely electricity and rent (e.g., the operating costs and upkeep of physical plant) – hence the trend towards setting up mining facilities in regions that typically have colder climates and cheaper electricity (e.g., near dams) as extracting the heat produced from mining is a real economic...
When the land was used up or the river was dirty in one place, man moved to another place. But this is no longer true. Man is now slowly polluting the whole world. Air pollution is still the most serious. It’s bad for all living things in the world, but it is not the only ...
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