【题目】Some scientists don't deny the existence of aliens ,but further evidence is still needed to _____ it.
A. compromise B. confirm
C. commit D. concern
在线课程【答案】B
【解析】考查动词辨析。A. compromise妥协；B. confirm确认，证实；C. commit犯罪，指派； D. concern涉及，关心。句意：一些科学家并不否认外星人的存在，但是进一步的证据仍需证实。表示证实证据，故选B.