植物扦插繁殖时，需要去除成熟叶片、保留芽和幼叶，这样可以促进插枝成活，其原因是（）。
①芽和幼叶生长迅速，容易成活②芽和幼叶储存有较多营养物质
③芽和幼叶能产生生长素，促进生根④去除成熟叶片可降低蒸腾作用
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When Our Words Collide
"Wanna buy a body?"That was the opening line of more than a few phone calls I got from freelance （自由职业）photographers when I was a photo editor at U.S.News.Like many in the mainstream press, I wanted to separate the world of photographers into "them",who trade in pictures of bodies or chase celebrities,and"us",the serious news people.But after 16 years in that role,I came to wonder whether the two worlds were easily distinguishable. Working in the reputable world of journalism,I assigned photographers to cover other people'5 nightmares.I justified invading moments of grief, under the guise（借口）of the reader' s right to know.I didn't ask photographers to trespass（冒犯）or to stalk（跟踪）,but I didn't have to.I worked with pros (同行）who did what others did, talking their way into situations or shooting from behind police lines to get pictures I was after.And I wasn't alone. In the aftermath of a car crash or some other hideous incident when ordinary people are hurt or killed, you rarely see photographers pushing past rescue workers to capture the blood and gore（血腥场面）.But you are likely to see local newspaper and television photographers on the scene-and fast. How can we justify our behavior?Journalists are taught to separate doing the job from worrying about the consequence of publishing what they record.Repeatedly,they are reminded of a news-business dictum （格言）:leave your conscience in the office.You get the picture of the footage ; the decision whether to print or air it comes later.A victim may lie bleeding,unconscious,or dead;your job is to record the image.You put away your emotions and document the scene. Te act this way partly because we know that the pictures can have important meaning.Photographs can change deplorable（凄惨的）situations by mobilizing public outrage or increase public understanding. However,disastrous events often bring out the worst in photographers and photo editors.In the first minutes and hours after a disaster occurs,photo agencies buy pictures.Often an agency buys a picture from a local newspaper or an amateur photographer arid put it up for bid by major magazines.The most keenly sought"exclusives"command tens of thousands of dollars through bidding contests. Many people believe that journalists need to change the way they do things,and it's our pictures that annoy people the most.Readers may not believe,as we do,that there is a distinction between sober-minded"us" and sleazy（低级庸俗的）"them".In too many cases, by our choices of images as well as how we get them,we prove our readers right. The writer never got an offer for a photograph of a dead person. A.Right B.Wrong C.Not mentioned [判断题]中华人民共和国的建立，标志着中国社会开始进入到社会主义社会初级阶段。
[填空题]请按下面注释的提示，将类B的构造函数定义补充完整。
C1assA
{
int a；
public：
A(int aa＝O){a＝aa；}
}；
class B：public A {
int b；
A c；
public：
//用aa初始化基类A，用aa＋1初始化类对象成员c
B(int aa}：【 】{b＝aa＋2}
}；
[单项选择]以下哪种溶血性贫血是由红细胞外异常所致（）
A. HbS病 B. 珠蛋白生成障碍性贫血 C. 自身免疫溶血性贫血 D. G6PD缺乏症 E. 遗传性椭圆形细胞增多症 我来回答: 提交
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