You’d better write down the phone number of that restaurant for future      .

A．purpose

B．reference

C．progress

D．memory

过度晒太阳会使皮肤粗糙，甚至引起皮肤癌，这是由于太阳光含有[ ]

A.红外线

B.紫外线

C.X射线

D.γ射线