D
本句的意思是：“即使研究有了新的發(fā)展，只有一小部分的試驗(yàn)可以不用動(dòng)物”。因此答案為D。variety和plenty分別表示“多樣”和“大量的”，意思不合適。amount后只能接不可數(shù)名詞，而test是可數(shù)名詞。
Don’ttrusteverything________youhavereadinthenewspapers.
Thenewspaperwillhavetoclosedownifitcannotincreaseits________considerably.
WepreferChinesebicycles __Japanesebicycles ___theirfinequality.
WhichofthefollowingtechniquesisNOTusedintheGrammar-TranslationMethod?________
___youlikeotheritems,kindlyletusknowandweshallbeonlytoopleasedtomakeyouoffersdirect.()
