问题
问答题 简答题
水生蔬菜有哪些共同特点？
答案
参考答案：宜水湿，不耐干旱，生长期间，田中要保持一定的水层；
生育期较长，多喜温暖气候，不耐霜冻；
根系较弱，根毛退化，要求在肥力较高的土壤上生长；
植株组织疏松多孔，茎秆柔弱，栽培中要注意防风挡浪；
多为无性繁殖，用种量大，繁殖系数低。
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水生蔬菜有哪些共同特点？
参考答案：宜水湿，不耐干旱，生长期间，田中要保持一定的水层；
生育期较长，多喜温暖气候，不耐霜冻；
根系较弱，根毛退化，要求在肥力较高的土壤上生长；
植株组织疏松多孔，茎秆柔弱，栽培中要注意防风挡浪；
多为无性繁殖，用种量大，繁殖系数低。
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| What makes a successful speech? First, you should have a good speech script (稿子) so that your ideas and language can attract people's attention. And some skills are necessary, too. Here are some suggestions on giving great speeches: ◆Beat nerves Relax yourself before and when making a speech. Practice your openingsentence three or four times. This will help make a sure start and a successful speech. When you stand on the stage, think of the audience (观众) as your family members and friends. ◆Keep it natural Natural body languages will help your speech: smile, stand straight and look at the audience. Do not drop your head or play with a pen. Also, dressing yourself nicely will help the audience feel respected. ◆Pace and pause (节奏和停顿) Pace and pause add color to your speech. Speak fast enough to keep people excited and slowly enough for people to fully understand you. After an important point, pause for a moment. It'll change the atmosphere (气氛) in the audience. | |||||||||||||||
Tips on giving speeches
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