1. Ultraviolet rays are

(A) absorbed by water in the atmosphere

(B) not absorbed by water in the atmosphere

(C) slowed down by water in the atmosphere

(D) rendered harmless by water in the atmosphere

2.In order for a color to be seen by a human, the light must be

(A)traveling slower than usual

(B)in the proper wavelength and frequency range

(C)traveling faster than usual

(D)momentarily stopped