正确答案: B

8

题目：若非连通无向图G含有21条边，则G的顶点个数至少为 ( )

解析：B

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举一反三的答案和解析：

[单选题]组织中最主要、最活跃的生产力要素是（ ）

内部公众

[单选题]在交往中，人与人之间人论职位高低、能力大小，还是职业差别、经济状况不同，都要一视同仁。既不能自恃清高，看不起别人，也不能自卑自怯，自暴自弃。这是人际交往中（ ）

平等原则的要求

[单选题]维护公平、公正、合理的竞争秩序，体现了我国社会主义市场经济的（ ）

有序性

[单选题]We all believe that modem technology can make life better because it makes everything faster. But by (11)______ everything up，we suffer losses we have not yet learnt to know. Our day begins with speedy urges：the alarm rings and you jump (12)______ bed,You take a quick shower. Then you wake the kids and (13) ______ them through breakfast so they won't miss the bus. At the dining table，you swallow some slices of bread with a cup of tea. When everything (14)______ ，you hurry to the car，thinking of the things you would buy from the supermarket on the way (15)______ . Driving 20 minutes in the busy traffic，you reach your workplace，rushing into the building and (16)______ up the stairs three at a time，arriving at your desk with seconds to spare. You take (17)______ deep breaths. Then，you instantly remember that the (18)______ you didn't finish last night must be faxed to Beijing by 10 o'clock in the morning.Yet it seems that the (19)______ we go，the further we fall behind. Not only in the literal sense of not getting done what we set out to do， (20)______ at a deeper level. It has come to the point where my days feel like an Olympic marathon.

speeding

解析：解析：本题考查动词词组词义的辨析。speed sth. up使某物加速；set sth. up摆放或竖起某物；wake sth. up使某事物活跃；look sth. up查阅。根据第一句可知，本段主要是讲由于现代科技的发展，人们的生活节奏加快了，以及这种现象所带来的后果。因此，A项符合题意。

[单选题]股份制是现代企业的一种（ ）

资本组织形式

[单选题]科学发展观的第一要义是( )

发展 B．以人为本

[单选题]下列属于附条件的合同是( )

甲对乙说，如果你考上大学，我就支付你四年的学费