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。
ltisnecessary___youtocomplywithourshippinginstructions.
WeenclosedourPurchaseConfirmationNo.4848__in__duplicate^)一式两份intriplicate(一式三份)
Thenewspaperwillhavetoclosedownifitcannotincreaseits________considerably.
ThetheoryoflanguageunderlyingtheGrammar-TranslationMethodwasderivedfrom_____Linguistics.
Wearelookingforwardto___yourL/CforOrderNo123.()