Questions 11 - 13 are basic on the following talk. You now have 15 seconds to read Questions 11 - 13.

We learn from the talk that it is easy to get a serious sunburn at the beaches because

A．the sunlight is fiercer at the beaches than elsewhere.
B．the skin gets the glare of the sun reflected back from the water and sand.
C．the ultraviolet rays there are much stronger.
D．the sunlight can also get through the cloud.