A:that; which
B:/; that
C:/ ; which
D:in which; what
—Look! That man looks like Mr Brown.
—It __________ be him, for he _________ America.
水中游动最快的旗鱼,速度可达108km/h;陆地上跑得最快的猎豹,1s可跑40m;空中飞行最快的褐海燕,每分钟能飞行5km,比较它们速度的大小( )