成语“信口雌黄”、“指鹿为马”共同体现了 [ ]

A、主观唯心主义的观点

B、客观唯心主义的观点

C、机械唯物主义的观点

D、朴素唯物主义的观点

In Hong Kong the eighth day of the fourth lunar month is a special day, called Bun Festival, ______ many residents and travelers gather at Cheung Chao island to celebrate a unique tradition.

A．which

B．when

C．while

D．as