The correct symbol of "therefore" is __________.[ ]
A. ∵
B. ∴
C. <
D. >
答案:B
Is it possible for us to make a conversation ____ a question like this to practice our ____? [ ]
A. by asking; pronunciation
B. by asking; pronounce
C. to ask; sound
D. with asking; speaking
计算机的硬件系统中,用于控制整个计算机的各个部件有条不紊地工作的部件是________。