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GRE阅读模拟在线练习附答案一百五十五

2018-11-12 16:44:00来源：网络

　　对于GRE阅读部分，最好的练习资料就是模拟资料。通过模拟练习，可以让大家更好地发现自己在备考中的不足，重点攻克自己的短板内容，有效的提升阅读分数。下面新东方在线GRE频道为大家整理了详细的内容，供大家参考。

点击查看》》》【GRE阅读真题在线练习附答案汇总】

　　Currently, the paramount problem in the field of biomaterials, the science of replacing diseased tissue with human-made implants, is control over the interface, or surface, between implanted biomaterials and living tissues. The physical properties of most tissues can be matched by careful selection of raw　materials: metals, ceramics, or several varieties of polymer materials. Even the requirement that biomaterials processed from these materials be nontoxic to host tissue can be met by techniques derived from studying the reactions of tissue cultures to biomaterials or from short-term implants. But achieving necessary matches in physical properties across interfaces between living and nonliving matter requires knowledge of which molecules control the bonding of cells to each other—an area that we have not yet explored thoroughly. Although recent research has allowed us to stabilize the tissue-biomaterial interface by controlling either the chemical reactions or the microstructure of the biomaterials, our fundamental understanding of how implant devices adhere to tissues remains woefully incomplete.

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

　　A.assessing and regulating the bonding between host tissue and implants

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

　　C.discovering new materials from which to construct implant devices

　　D.deciding in what situations implants are needed

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

　　The passage suggests which of the following about the recent research mentioned in lines 23-30?

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

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

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

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

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

　　The author's primary purpose is to

　　A.answer a theoretical question in the field of biomaterials

　　B.discuss the current state of technology in the field of biomaterials

　　C.resolve a research dispute in the field of biomaterials

　　D.predict an ethical crisis for biomaterials researchers

　　E.suggest some practical benefits of biomaterial implants

　　正确答案:A C B

　　以上就是关于“GRE阅读模拟在线练习附答案一百五十五”的内容，更多精彩内容，请关注GRE频道!


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