—I’m afraid I can’t go to your party; I have lots of things to do.

—________.

A．Take it easy

B．No problem

C．So what

D．What a shame.

光固化复合树脂充填时，分层光照每层的厚度不超过（）。

A.0.5mm

B.1mm

C.1.5mm

D.2mm

E.2.5mm