Đánh giá năng lực Hà Nội
Đánh giá năng lực Hà Nội
Read the following passage about biodiversity and mark the letter A, B, C or D on your answer sheet to indicate the
Read the following passage about biodiversity and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 23 to 30.
Biodiversity is the range of living things in an area. During the last 100 years, scientists have seen a great decline in biodiversity. This means a great loss for humans as the stewards of the planet Earth.
Some studies show that one in eight plant species is threatened with extinction. It is estimated that 140,000 species of plants are lost each year. Many of these lost plants could have been very useful in creating new drugs to combat disease. This is due to the use of unsustainable ecological practices.
Most of the extinctions in the last thousand years are due to humans. The main cause is the chopping down of tropical rain forests. These habitats are being turned into pasture, cropland, and orchards. Most of this destruction is done to create pasture for beef cattle. It is also done to make wheat for bread as well as fruit for human consumption.
The introduction of exotic species is another threat. When exotic species are introduced to a habitat, they try to establish a self-sustaining population. Then they threaten the local species. These foreign species may be predators or parasites. Or they may simply be aggressive. They deprive the local species of nutrients. Because the local species haven't had a chance to evolve, they often lack defenses. They cannot compete against the exotic species.
The rich diversity across the world exists only because of barriers. The main barriers are seas and oceans. These barriers could never be crossed by natural means. But since humans invented ships and airplanes, it is now possible for species to meet. There is no time for them to adapt, but humans continue to combine species from different regions. The world's ecosystems will soon be dominated by very few, aggressive super-species.
In order to reverse these problems, people need to minimize their consumption. They need to consume less beef and other products that require damage to the natural environment. Also, governments need to impose strict rules against destroying natural land and introducing exotic species.
Which of the following is NOT mentioned as a threat to biodiversity?
Đáp án đúng là: B
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