根据"Scientists believe the UV rays of the sun irritate the nose of these people, so they sneeze."可知,此处在介绍人们打喷嚏的一个原因。 故选 A项。 C 【解 】细节理解题。 根据“If someone nearby sneezes, remember to tell them ' Gesundheit'... It is the German word that wishes someone...
Light, x-rays, microwaves, and radio waves are examples of which type of energy? What form of ionizing radiation is the most penetrating? What is the electromagnetic radiation spectrum? What is radiation in physical chemistry? Where is the sun's incoming solar radiation the strongest?
Time of day: Avoid sun exposure in the middle of the day—between 10 a.m. and 4 p.m.—when the UV rays are strongest. In addition, be mindful that clouds offer little protection, and UV rays can bounce off surfaces like water, sand, snow or pavement, leading to increased UV exposur...
It's worth having a shot of tomato, watermelon, pink grapefruit or guava juice before going out into the sun. The lycopene they contain has been shown to help defend you against damage caused by the sun's UV rays....
Are UV rays ionizing radiation? Does beta radiation have mass? Is curium nuclear? Is electromagnetic radiation safe? What generates electromagnetic radiation? What radiation does cobalt-60 emit? Where is the sun's incoming solar radiation the strongest?
Use a Sunscreen: Always use sunscreen when you are out in the sun for long periods of time, no matter how cloudy or sunny it is outside. Wear Sunglasses: Sunglasses will help to protect your eyes from UV rays and prevent sunburns on your face or eyes. ...
Do you ever sneeze when you walk into bright sunlight? Some people say that happens to them often. Scientists believe the UV rays of the sun irritate (刺激) the nose of these people so they sneeze. If someone nearby sneezes,remember to tell them “Gesundheit!” That is a funny-looking ...
Spider silk of Nephila clavata showed the high resistivity against UV ray while silkworm silk of Bombyx mori was easily decomposed by UV rays. The UV resistivity of silk protein was evaluated numerically using SDS PAGE measurements. Degradation rate for the spider silk was smaller by 40 % tha...
UV rays excite the light-sensitive cells in your eyes and they work in overload. The chemicals these cells produce can bleed into other parts of your eyes and cause damage that takes months to heal. Staring at the sun for even a few seconds causes asunburnin your eyes like prolonged expo...
Sun Protection:Ultraviolet (UV) rays from the sun can increase the effects of cortisol on the skin. They break down collagen and elastin even more rapidly. Always wear abroad-spectrum sunscreenwith at least SPF 30, and remember to reapply every two hours when you’re outdoors. ...