Read the article. Choose the best option A, B, C, or D.
Invasive species are the foreign plants or animals which come into a place and badly affect it. Invasive species can harm local living things and people's health.
In the 1970s, fish farmers brought silver carp into the United States with the hope to improve water quality in fish ponds. Many carp then escaped into the Mississippi River. They have gradually taken over the resources of paddlefish in the river. Their population have grown so rapidly that paddlefish don't have enough food and are dying out.
Water hyacinth, which is native to South America, came to Africa in the 1980s. At First, people planted it for its beautiful purple flowers. Since then, the plant has spread very quickly and covered Lake Victoria, the largest lake in Africa. Water hyacinth blocks the flow of lake water and creates homes for mosquitoes and insects.
Since invasive species cause many types of problems, there should be stricter laws to stop people from taking plants and animals to a new place.
1. What is the article mainly about?
A. Definition of invasive species.
B. Some troubles caused by invasive species.
C. How local environments affect new species.
D. The impact of invasive animals on local people.
2. How do silver carp affect paddlefish in the Mississippi River?
A. They eat paddlefish,
B. They become food for the paddlefish.
C. They use up most of the paddlefish's food.
D. They make the river water dirty.
3. People in Africa first used water hyacinth as a type of _______.
A. decorative plant
B. herb medicine
C. fish food
D. insect killer
4. Which of the following is true about water hyacinth in Lake Victoria?
A. It is poisonous to local people.
B. It feeds the paddlefish in the lake.
C. it helps clean up the lake water.
D. It allows mosquito populations to increase.
5. The text suggests preventing the spread of invasive species by _______.
A. introducing stricter laws
B. taking animals to a new place
C. raising people's awareness
D. growing new types of plants
