三年级语文下册第四单元重点知识积累


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三年级语文下册第四单元重点知识积累

一、重点字音

关系xì 淡雅yǎ

吻合wěn 芬芳fāng

辨认biàn 包括kuò

掀开xiān 干燥zào

大概gài 超常chāo

准确无误wù

二、重点词语

芬芳 迷人 艳丽 睡莲 醒来 欣然 苏醒 含笑 展示 昆虫 修建 组成

蜜蜂 辨认 能力 阻力

将近 包括 检查 迷失

准确 无误 尽管 沿途 陌生 确实 记忆 本能 万寿菊 争奇斗艳

三、多音字

稍shāo 稍微 稍稍 稍纵即逝

稍shào 稍息

四、同音字

fēn (芬)芳 (纷)飞 (分)数

zǔ (组)合 (阻)力 (祖)国

chá 检(查) 观(察) 调(查)

五、形近字

建(建设) 蜂(蜜蜂)

健(健康) 锋(锋利)

瓣(花瓣) 括(包括)

辨(分辨) 掠(掠过)

检(检查) 途(旅途)

验(经验) 除(除了)

六、近义词

留心~留意 舒展~伸展 密切~紧密 辨认~分辨 准确~确切 推测~推算

七、反义词

艳丽—淡雅 干燥—潮湿

减少增加 陌生熟悉

有趣无聊 安静喧哗

八、词语搭配

(艳丽)的蔷薇

(密切)的关系

(娇嫩)的花瓣

(淡雅)的花蕾

(美丽)的笑脸

(安静)的角落

九、词语仿写

争奇斗艳(含近义词):和颜悦色 志同道合

荡来荡去(×来×去):跑来跑去 跳来跳去

十、四字词语

争奇斗艳 芬芳迷人

欣然怒放 含笑一现

准确无误 确确实实

十一、常考语句

1.拟人 凌晨四点,牵牛花吹起了紫色的小喇叭。(运用拟人的修辞手法,生动形象地描绘出了牵牛花开花时的状态。)

仿写:牡丹花绽开了美丽的笑脸。

2.拟人昙花却在九点左右含笑一现·…···(把昙花当成人来写,“含笑一现”写出了昙花开放时间短的特点。)

3.语言准确

(1)二十只(左右)被闷了好久的蜜蜂向四面飞散,好像在寻找回家的方向。

(2)蜜蜂飞得很低,几乎要触到地面,(大概)这样可以减少阻力。(“左右”说明蜜蜂的数目不确切;“好像”“大概”说明这是法布尔在实验未被验证前的猜测,这些词语的使用体现了语言的准确性。我们从中可以体会到法布尔是一个善于观察和思考的人。)

十二、课文回顾

1.《花钟》中列举了不同植物开花时间不同的两个原因:一是与温度、湿度、光照有着密切的关系;二是与昆虫活动的时间有关。

2.《蜜蜂》重点介绍了作者法布尔实验的过程:①捉些蜜蜂放进纸袋,让它们与外界隔绝;②走到四公里外给蜜蜂做上记号后放飞;③记录飞回的蜜蜂数量。通过实验证明了蜜蜂确确实实具有辨认方向的能力。这些体现了法布尔善于思考、严谨求实的科学态度及其严谨的工作作风。

3.《小虾》形象生动地描写了不同年龄虾的体貌特征和小虾悠闲、自在的生活状态。

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