GRE阅读练习每日一篇(三十二)_GRE阅读

　　17. According to the passage, the major problem currently facing scientists in the field of biomaterials is

　　assessing and regulating the bonding between host tissue and implants

　　controlling the transfer of potentially toxic materials across the interface of tissue and implant

　　discovering new materials from which to construct implant devices

　　deciding in what situations implants are needed

　　determining the importance of short-term implants to long-term stability of tissue-implant interfaces

　　18. The passage suggests which of the following about the recent research mentioned in lines 19-25?

　　It has solved one set of problems but has created another.

　　It has concentrated on secondary concerns but has ignored primary concerns.

　　It has improved practical applications of biomaterial technology without providing a complete theoretical explanation of that improvement.

　　It has thoroughly investigated properties of biomaterials but has paid little attention to relevant characteristics of human tissue.

　　It has provided considerable information on short-term implant technology but little on long-term implant technology.

　　19. The author s primary purpose is to

　　answer a theoretical question in the field of biomaterials

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