— ______ did you visit the Great Wall? ( )— Last Sunday.
A:Where
B:What
C:When
D:How
鸟类和哺乳类是由哪一种动物进化而来的?( )
请你用你学过的知识推导无论是并联和串联电路的总功率都等于各个用电器消耗的电功率之和.
A. is B. What C. paint D. but