Bài tập ôn thi giữa học kỳ 2 môn Tiếng Anh lớp 11

Many environmental experts are pessimistic about the future of our (1)____. They say that in the next few years harmful (2)____ will further damage the ozone layer, there will be more losses of irreplaceable tropical rainforests. and serious air pollution will cause the climate itself to change. They also warn us that Third World (3)____ will continue to suffer ecological consequences, while the (4)____ countries consume the vast majority of the world’s (5)____. Animals are also at (6)____. It is feared that some (7)____ species may soon die out, as their natural (8)____ are destroyed. In some cases, the only way to save rare species from (9)____ is to breed them in captivity.

Energy is fundamental to human beings, especially to poor people – the one-third of humanity that does not have modern energy supplies like electricity, with which their life could be improved.

Many people who live in countryside have to gather fuel wood. This takes a lot of time. Moreover, it causes indoor air pollution because of heavy smoke. For many people living in rural areas in developing countries of the world, biogas (CH4) is the large energy resources available and costs almost nothing. The main use of biogas is for cooking and heating. As biogas is smoke-free, it helps solve the problem of indoor air pollution. Moreover, plant waste and animal manure cost almost nothing. (fundamental: essential)

The tendency to use renewable energy sources is on the increase when non-renewable ones are running out. In the near future, people in the developing countries may use wind or sea waves as the environmentfriendly energy sources.