Lately some scientists are experimenting ___________ white mice to ____________ this kind of medicine.
A．on,try onB．with, test onC．on ,test outD．with,carry out
C
句意：最近一些科學(xué)家正在在白鼠身上做實(shí)驗(yàn)來(lái)檢測(cè)這種藥。短語(yǔ)：experiment on 在什么上做實(shí)驗(yàn)，test out 檢測(cè)，測(cè)試，所以選C。
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