基托内出现圆形大气泡的原因是

A．热处理温度不够

B．热处理时间过长

C．热处理时升温过快

D．塑料充填过多

E．塑料充填不足

Because of the p sun the new sitting-room curtains have______from dark blue to grey.

A．fainted

B．bleached

C．paled

D．faded