To save electricity, we are cutting down __________ our central heating.
A. on
B. up
C. for
D. of
Đáp án: A
Giải thích: cụm từ cut down on: giảm thiểu cái gì
Dịch: Để tiết kiệm điện, chúng tôi giảm hệ thống sưởi trung tâm
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Without plants, most water ____________ off as soon as it falls, taking away valuable soil.
Man and most animals need a _____________ supply of water to live.
There are about 3,000 plants __________ values as medicines against cancer, AIDS, heart disease and many other sicknesses.
Both fossil fuel _______ non-renewable resources are very important to our life.
Deforestation _________ destroying Earth’s plant and animal variety.
Each year about fifty hundred_________ of plants and animals are already being eliminated.
__________ we conserve natural resources, they will run out very soon.