给一无色溶液滴入数滴无色酚酞试液，溶液使酚酞变红，这说明该溶液是（ ）
A．酸性溶液
B．酸的水溶液
C．碱性溶液
D．碱的水溶液
答案：C
Taking photographs is strictly ______ here, as it may damage the precious cave paintings.
A．forbidden
B．rejected
C．excluded
D．denied
买入看跌期权的对手就是卖出看涨期权。( )
