How many ______ known altogether？A．species of fishes areB．species of fish isC．specieses of

How far water drops to the turbines in a power station is known as ______ .A．the headsB．th

有如下类定义： classPoint{ private; staticinthow_many; }; ___________how_many=0;

__________？ —About six yuan a kilo. A. How old B. How much C. How often D. How many

As is known to all, there are many forms of energy, ______is solar energy.A．one of thatB．o

______your timely advice, I would never have known how to go about the work.A．UnlessB．Exce

It is well known that a child does not reach emotional security______ a good many years af