Question

[Lê Quỳnh Anh]

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.

Điền vào số (47)

A. who                 

B. where               

C. that  

D. when

Answer 1

[Dương Hoàn Anh]

Đáp án C

Đại từ quan hệ thay thế cho danh từ “the animals” nên ta dùng that.

Who dùng cho người.

Where dùng cho nơi chốn.

When dùng cho thời gian.

That dùng được cho cả người, động vật, sự việc, nơi chốn và thời gian; tuy nhiên, không dùng trong mệnh đề không xác định (mệnh đề có dấu phẩy)