题干

下图为植物的嫁接示意图,看图回答下列问题:

(1)嫁接是绿色开花植物人工营养生殖常用的方法之一,除此之外绿色开花植物人工营养生殖常用的方法还有____ 、____ 等。
(2)如图所示的嫁接法为____ 法;嫁接材料由____ 、____ 两部分组成,前者的主要特性是____ ,后者的主要特性是____ 。
(3)保证嫁接成活的关键是____ 。
(4)“味道好的优质桃和抗性强的山桃”这个嫁接组合中,作为接穗的是____ ,作为砧木的是____ 。

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答案(点此获取答案解析)

\u6266\u63d2,\u538b\u6761,\u679d\u63a5,\u63a5\u7a57,\u7827\u6728,\u6027\u72b6\u4f18\u826f,\u6297\u6027\u5f3a,\u4f7f\u63a5\u7a57\u7684\u5f62\u6210\u5c42\u4e0e\u7827\u6728\u7684\u5f62\u6210\u5c42\u7d27\u5bc6\u7ed3\u5408,\u5473\u9053\u597d\

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任务型阅读

    People in the United States have many ways to get news, some of which are available 24 hours a day. In a recent survey(调查), about 15 percent of American interviewees said that they spend less than one-half to two hours per day watching, listening to, or reading the news. News comes from every source, not only from printed ways, but from TV, radio, and the Internet as well.

    With the increased availability of news, serious questions have been raised about the role of the news media in society. Should the media report every detail about every story, even when the information does not seem timely or valuable? Some researchers are concerned that by focusing on everything at once, the media increasingly ignore the more important social, political and economic problems that we face. We cannot concentrate on what's important by reading about what is not. One extreme example of this is the type of information covered by the tabloid(小报)media, which focus on negative stories of violence and crime.

    How can people deal with all the news that is available to them? Some become “news resisters” and choose to turn their backs on news, resisting their desire to turn on the TV and read the paper every day. They argue that although daily news reports may provide us with many facts, they do not include the background or some information that we need to understand news events. They suggest that, instead of daily reports, we look for information that has more in-depth analysis of the news, such as monthly magazines.