题干

在实数-2,2-1,83,π
3
,22
7
中,无理数有(    )   

A:2个

B:3个

C:4个

D:5个

上一题 下一题 0.0难度 选择题 更新时间:2017-10-18 08:02:51

答案(点此获取答案解析)

B

同类题1

阅读下面两段文言文,完成后面小题。
       【甲】侍中、侍郎郭攸之、费讳、董允等,此皆良实,志虑忠纯,是以先帝简拔以遗陛下。愚以为宫中之事,事无大小,悉以咨之,然后施行,必能裨补漏,有所广益。
        将军向宠,性行淑均,晓畅军事,试用于昔日,先帝称之曰能,是以众议举宠为督。愚以为营中之事,悉以咨之,必能使行阵和睦,优劣得所。
亲贤臣,远小人,此先汉所以兴隆也;亲小人,远贤臣,此后汉所以倾颓也。先帝在时,每与臣论此事,未尝不叹息痛恨于桓、灵也。侍中、尚书、长史、参军,此悉贞良死节之臣,愿陛下亲之信之,则汉室之隆,可计日而待也。——选自《出师表》
       【乙】准少英迈,通《春秋》三传。年十九,举进士。太宗取人,多临轩顾问,年少者往往罢。或教准增年,答曰:“准方进取,可欺君邪?”后中第,授大理评事,知归州巴东、大名府成安县。每期会赋役,未尝辄出符移ƒ,唯具乡里姓名揭县门,百姓莫敢后期。累迁殿中丞、通判郓州。召试学士院,授右正言、直史馆,为三司度支推官,转盐铁判官。诏百官言事,而准极陈利害,帝益器重之。擢尚书虞部郎中、枢密院直学士,判吏部东铨。尝奏事殿中,语不合,帝怒起,准辄引帝衣,令帝复坐,事决乃退。上由是嘉之,曰:“朕得寇准,犹文皇之得魏徵也。”                ——选自《宋史•寇准传》
【注】①三传:《左氏传》《公羊传》《谷梁传》。②多临轩顾问:大多会到亭台处观察提问。③符移:宜府征调敕命文书。④揭:公布。⑤后期:误期。⑥累:连续。⑦擢:提升。

同类题4

阅读理解

    According to the findings of a new study, telling kids they're smart enhances the idea that intelligence is a genetic gift rather than a skill that ran he improved, and children who think their intelligence is fixed are not likely to pay attention to mistakes and recover from them.

    In the study publisher! online, researchers looked at 123 children who were about 7. The team assessed the children to determine whether they had a “growth mindset(思维定式)”. They asked the children to complete a fast-paced computer task while their brain activities were recorded. During the recording, researchers noted that brain activity stopped within a half-second after making a mistake. The larger the brain response was, the more the child focused on the error.

    Based on the data they collected, the researchers concluded that children with a “growth mindset” were much more likely to have a larger brain response after making a mistake, and in turn were more likely to improve their performance by paying closer attention to the task after making an error.

    For parents, the lessons are clear: for starters, don't pay praises that suggest intelligence is fixed. If a child hands you an A test, don't say “You are smart!” Instead say “Wow, that study really paid off!”

    Second, focus on using errors to work together and learn. Many parents and teachers shy away from mentioning a child's mistakes, telling them “It's OK. You'll get it next time.” without giving them the opportunity to figure out what went wrong. Instead, it's better to tell the child that mistakes happen, and to pay attention and work to figure out where and how they made the mistake.