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XI. Read the passage and choose the best option to complete each blank
Any change in one part of an ecosystem can cause changes in other parts. Droughts, storms and fires can change ecosystems. Some changes (46)_______ ecosystems. If there is too little rainfall, plants will not have enough water to live. If a kind of plant dies off, the animals (47)_______ feed on it may also die or move away. Some changes are good for ecosystems. Some pine forests need fires for the pine trees to reproduce. The seeds are sealed inside pinecones. Heat from a forest fire melts the seal and lets the seeds (48)_______. Polluting the air, soil, and water can harm ecosystems. Building dams on rivers for electric power and irrigation can harm ecosystems (49)________ the rivers. Bulldozing wetlands and cutting down forests destroy ecosystems. Ecologists are working with companies and governments to find better ways of (50)________ fish, cutting down trees, and building dams. They are looking for ways to get food, lumber, and other products for people without causing harm to ecosystems.
Câu hỏi:-
A.
harms
- B. harmful
- C. harmless
- D. harm
Lời giải tham khảo:
Đáp án đúng: D
-
A.
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CÂU HỎI KHÁC
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- What does the passage mainly discuss
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- Some changes (46)_______ ecosystems. If there is too little rainfall
- If a kind of plant dies off, the animals (47)_______ feed on it may also die or move away
- Heat from a forest fire melts the seal and lets the seeds (48)_______.
- Building dams on rivers for electric power and irrigation can harm ecosystems (49)________ the rivers
- Ecologists are working with companies and governments to find better ways of (50)________ fish,
