在线求指导：听下面一段材料,回答

听下面一段材料,回答第1-3题.

1.What is the main topic of the talk?

A.Substances used in bone repair.
B.How to maintain healthy bones.
C.The structure of sea coral.

1.What does the speaker mention as a disadvantage of transplanting bone from donors?

A.It is too expensive.
B.The patient might reject the bone.
C.There are not enough donors.

3.What is one reason that coral works well as a replacement for bone?

A.It has holes into which new bone material can grow.
B.Its composition is similar to that of bone.
C.It is not as brittle as bone.

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1-3: ABA

1年前

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