霞是日出日落时阳光透过云层，发生（　　）作用，使天空的云层呈现黄、橙、红等色彩的自然现象。

A、折射

B、衍射

C、反射

D、散射

相关问题推荐

• 在PowerPoint2003演示文稿中插入文件“学校.swf”，下列方法可行的是（）。

  A、打开“学校.swf”，执行“复制”→“粘贴”命令

  B、在“视图”菜单中，选择“工具栏”→“控件工具箱”

  C、在“插入”菜单中，选择“影片和声音”

  D、在“插入”菜单中，选择“图片”

  查看答案

• According to a recent research， the old are more than twice as likely to have a positive attitude to life___ the young.

  A、as

  B、than

  C、while

  D、until

  查看答案

• FlashMX中，不含任何对象的关键帧叫（）。

  A、扩展帧

  B、关键帧

  C、空白关键帧

  D、引导帧

  查看答案

• 请阅读 Passage 2,完成第 26~30小题。Passage 2It's no surprise that Jennifer Senior's insightful, provocative magazine cover story, "I love My Children, I Hate My Life," is arousing much chatter-nothing gets people talking like the suggestion that child rearing is anything less than a completely fulfilling, life-enriching experience. Rather than concluding that children make parents either happy or miserable, Senior suggests we need to redefine happiness: instead of thinking of it as something that can be measured by moment-to-moment joy, we should consider being happy as a past-tense condition. Even though the day-to-day experience of raising kids can be soul-crushingly hard, Senior writes that"the very things that in the moment dampen our moods can later be sources of intense gratification and delight."The magazine cover showing an attractive mother holding a cute baby is hardly the only Madonna-and-child image on newsstands this week. There are also stories about newly adoptive-and newly single-mom Sandra Bullock, as well as the usual"Jennifer Aniston is pregnant" news. Practically every week features at least one celebrity mom, or mom-to-be, smiling on the newsstands.In a society that so persistently celebrates procreation, is it any wonder that admitting you regret having children is equivalent to admitting you support kitten-killing? It doesn't seem quite fair, then, to compare the regrets of parents to the regrets of the childless. Unhappy parents rarely are provoked to wonder if they shouldn't have had kids, but unhappy childless folks are bothered with the message that children are the single most important thing in the world: obviously their misery must be a direct result of the gaping baby-size holes in their lives.Of course, the image of parenthood that celebrity magazines like Us Weekly and People present is hugely unrealistic, especially when the parents are single mothers like Bullock. According to several studies concluding that parents are less happy than childless couples, single parents are the least happy of all. No shock there, considering how much work it is to raise a kid without a partner to lean on; yet to hear Sandra and Britney tell it, raising a kid on their "own" (read: with round-the-clock help) is a piece of cake.It's hard to imagine that many people are dumb enough to want children just because Reese and Angelina make it look so glamorous: most adults understand that a baby is not a haircut. But it's interesting to wonder if the images we see every week of stress-free, happiness-enhancing parenthood aren't in some small, subconscious way contributing to our own dissatisfactions with the actual experience, in the same way that a small part of us hoped getting"the Rachel" might make us look just a little bit like Jennifer Aniston.It is suggested in Paragraph 3 that childless folks ____.

  A、are constantly exposed to criticism

  B、are largely ignored by the media

  C、fail to fulfill their social responsibilities

  D、are less likely to be satisfied with their life

  查看答案

• FlashMX中，有关元件和实例的说法不正确的是（）。

  A、元件放到舞台上称为实例

  B、一个元件可以创建多个实例

  C、改变实例的大小，会影响由同一元件创建的其他实例

  D、改变元件，由此元件创建的实例也会改变

  查看答案