新GRE考试辅导：阅难难句的攻克（22）

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41.The molecular approach to detecting peptide hormones using cDNAprobes should also be much faster than the immunological method becauseit can　take years of tedious purifications to isolate peptide hormonesand then develop antiserums to them.  
　　采用cDNA探子来测定肽激素的这一分子生物学方法同时也应该比免疫学的方法速度来得快，因为对于免疫的方法来说，需耗费好几年枯燥的提纯进程，方能将肽素分离了出来，然后再培养出针对它们的抗血清。
0 [7 A3 W$ r9 V/ s" d# p　　42.This succession was based primarily on a series of deposits　andevents not directly related to glacial and interglacialperiods，rather than on the more usual modern method of studyingbiological remains found in interglacial beds themselvesinterstratified within glacial deposits.
* ]4 Y. Q  e/ F' ?$ F　　这一序列演替(succession)所依据的，主要是一系列与冰川期和间冰期并不直接相关的地质沉积物和地质事件，而不是依据更为普遍的现代方法，去研究间冰层(interglacialbed)中所发现的生物残留物，而这些间冰层本身又在冰川沉积物发生间层化(interstatified)。