Question

The soil ________ the dead leaves above．

1. A.
   is made of
2. B.
   made from
3. C.
   is made in
4. D.
   is made by

Answer 1

B
解析：
句意：“土壤是由上面的落叶腐烂而成的。”be made from“由……制成”，从成品表面看不出原料，be made of“用……制成”，从成品表面能看出原料，be made in “由某地生产或制造”“产于某地”，in后接表示地点的名词，be made by“被……制造”是被动语态，by后接动作的发出者，根据题意，应选项B项。