一个化肥厂原计划14天完成一项任务，由于每天多生产化肥3.5吨，结果9天就完成任务．原计划每天生产化肥____ 吨．

    A rainforest is an area____(cover) by tall trees with the total high rainfall spreading quite equally through the year. Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate.____the forest cover, these areas would reflect more heat into the atmosphere,____ (warm) the rest of the world. Losing the rainforests may also influence wind and rainfall patterns, potentially causing certain natural disasters all over the world.

    In the past hundred years, humans ____(begin) destroying rainforests in search of three major resources: land for crops, wood for paper and other products, land for raising farm ____ (animal). This action affects the environment as a whole. For example, a lot of carbon dioxide in the air comes from burning the rainforests. People____(obvious) have a need for the resources we gain from cutting trees,____ we will suffer much more than we will benefit.

    Rainforests are often called the world's drug store. More than 25% of the medicines we use today come from plants in rainforests. However, fewer than 1% of rainforest plants have been examined for their ____(medicine) value. It is extremely likely ____our best chance to cure diseases ____(lie) somewhere in the world's shrinking rainforests.

设a,b为实数，则“0<ab<l”是“$b<\frac{1}{a}$”的 (     )

第二次工业革命后，恩格斯指出：“资本家本身不得不部分地承认生产力的社会性。大规模的生产机构和交通机构起初由股份公司占有，后来由托拉斯占有，然后又由国家占有。”这反映出的本质问题是（     ）