D
本句的意思是:“即使研究有了新的发展,只有一小部分的试验可以不用动物”。因此答案为D。variety和plenty分别表示“多样”和“大量的”,意思不合适。amount后只能接不可数名词,而test是可数名词。
ThetheoryoflanguageunderlyingtheGrammar-TranslationMethodwasderivedfrom_____Linguistics.
Itisdifficulttounderstandthiskindof_______calculation.
Totrade____thepeopleofalleountries____thebasisofequalityandmutualbenefitisourestablishedpolicy.
Accordingtotheshipping_____itwillbeimpossibleforustoshipthegoodsinOctober.()
WhichofthefollowingtechniquesisNOTusedintheGrammar-TranslationMethod?________