人和类人猿有共同祖先。 是人区别于猿的重要特征。
直立行走
人类祖先的直立行走，是从古猿进化到人具有决定意义的一步。
－I’ll come to see your performance at 9:00 tomorrow morning.
－I’m sorry, by then my performance ______ and I _______ reporters in the meeting room.
A．will end; will meet
B．will have ended; will be meeting
C．will be ended; am going to meet
D．is to end; will be meeting
地球上四大洋中，面积第二大的是( )
A．太平洋
B．印度洋
C．大西洋
D．北冰洋
