下列各项中不属于符号的是。
A. 十字路口的红绿灯
B. 轮船上的旗语
C. 化学方程式中表示气体的“↑”
D. 从烟囱冒出的烟
Weforgotto_______thecomputertothephoneline.
A. contact
B. reach
C. touch
D. connect
Thisbookisdifficulttounderstandbecausetherearetoomanytechnical_______init.
A. names
B. terms
C. calls
D. minds
Thisisthereason__________youbuiltthewebsiteanditisthereason_______youaremakingitaccessible.
A. why,which
B. why,why
C. which,why
D. which,which