Question

The bed ____wood ____three separate parts.

1. A.
   is made from; is made up of
2. B.
   made by; is made with
3. C.
   made of; is made of
4. D.
   is made up of; is made by

Answer 1

C
be made of和be made from都表示“由……制成”，前者可以看到制造材料，后者则看不出材料。制床用的材料是可见的。be made up of表示“由……组成”。句中made of wood是过去分词短语作定语，修饰the bed.