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请根据短文内容,回答题。 Generation M (多媒体的一代) Being able to multitask is considered by most people as a welcome skill, but not according to a recent study which claims that young people between the ages of eight and eighteen of the so-called Generation M are spending a considerable amount of their time in fruitless efforts as they multitask. It argues that, in fact, these young people are wasting away as much as half of their time again as they would if they performed the very same tasks one after the other. Some young people are juggling an ever larger number of electronic devices as they study. At the same time that they are working, young adults are also surfing on the lnternet, or sending out emails to their friends, and / or answering the telephone and listening to music on their iPods or on another computer. As some new device comes along, it too is added to the list rather than replacing one of the existing devices. Other research has indicated that this multitasking is even affecting the way families themselves function as young people are too wrapped up in their own isolated (孤立的,隔绝的 )worlds to interact with the other people around them. They can no longer greet family members when they enter the house nor can they eat at the family table. All this electronic wizardry (魔力,法术 ) is also seriously affecting young people&39;s performance at university and in the workplace. When asked about their perception ( 看法,见解 )of the impact of modem gadgets (小巧的机械装置 ) on their performance of tasks, the overwhelming majority of young people gave a favourable response. The response from the academic and business worlds was not quite as positive. The former feel that multitasking with electronic gadgets by children affects later development of study skills, resulting in a decline in the quality of writing, for example, because of the lack of concentration on task completion. They feel that many undergraduates now urgently need remedial (补救的) help with study skills. Similarly, employers feel that young people entering the workforce need to be taught all over again, as they have become deskilled (失去技能) . While all this may be true, it must be bome in mind that more and more is expected of young people nowadays; in fact, too much. Praise rather than criticism is due in respect of the way today&39;s youth are able to cope despite what the older generation throw at them. According to a recent study, what is probably true about the multitasking Generation M? 查看材料
A.
They are highly commended for being so effective and efficient
B.
They waste more time than they should save, contrary to common assumptions
C.
They should prioritize and focus on the most important tasks on hand
D.
They need to improve their organizational skills so as to complete all their tasks
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【判断题】如果系数矩阵的秩等于增广矩阵的秩,方程组有唯一的解
A.
正确
B.
错误
【简答题】癫痫失神性发作(小发作)首选
【判断题】古代的注音方法常用反切和直音,有时也以“读若”、“读如”、“如字”等用语指出读音。()
A.
正确
B.
错误
【简答题】下图是植物营养生殖的几种方法,请据图回答下列问题: (1)填出各图所示生殖方法的名称并举例: A ,如: ;B ,如: ;C ,如: ;D ,如: 。 (2)其中B方法一般分为 ,为确保培育成功,关键环节是 。 (3)假设在A瓶内是某木本植物的一段茎尖,经过组织培养,能长成一株植物,那么,这段茎尖可称为 。在培养时,A瓶中应保持 的条件。
【单选题】如果非齐次线性方程组 有无数多解,则下列说法错误的是
A.
系数矩阵的秩等于增广矩阵的秩
B.
系数矩阵的秩小于 n
C.
系数矩阵的秩小于增广矩阵的秩
D.
b 被 A 的列线性表示
【简答题】请填写下列各项采用的无性生殖的方法的名称,并举例。 A.________,如:________; B.________,如:________; C.________,如:________; D.________,如:________。
【简答题】采集标本的预处理方法有物理方法,如();化学方法,如();诱饵法,如()。
【简答题】小丽同学有3件不同如衬衣,2条不同如裤子(下装),3条不同如裙子(下装). (1)穿衬衣和裤子有几种搭配方法? (2)穿衬衣和裙子有几种搭配方法? (3)上衣和下装共有几种搭配方法?
【简答题】_______是降低癌症发病率的主要措施。治疗癌症的主要方法是 _______疗法(如手术切除肿瘤) 、______疗法(如使用抗癌药物)和放射疗法。
【单选题】下列关于非齐次线性方程组的解的情况说法不正确的是?
A.
如果系数矩证的秩等于增广矩阵的秩且等于未知数个数n,则方程组有唯一解。
B.
如果系数矩证的秩等于增广矩阵的秩且小于未知数个数n,则方程组有无穷解。
C.
如果系数矩证的秩小于增广矩阵的秩且小于未知数个数n,则方程组无解。
D.
如果系数矩证的秩小于增广矩阵的秩且小于未知数个数n,则方程组无穷解。
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