A.鸵鸟 | B.老鼠 | C.青蛙 |
A.吊车 | B.水龙头 | C.旗杆 |
A.四边形 ![]() | B.五边形 ![]() | C.三角形 ![]() | D.六边形 |
A.链条传动可以改变力的方向 |
B.齿轮传动不能改变力的方向 |
C.齿轮传动不能远距离传递力 |
A.妈妈 ![]() | B.爸爸 |
A.![]() | B.![]() | C.![]() |
A.人 | B.青蛙 | C.鹅 |
A.美观 | B.能承受很大的冲击力 | C.减轻帽子的自身重量 |
A.三角形结构最稳固 |
B.杠杆 |
C.平衡 |
A.保持水分 | B.保护种子别碰伤 | C.纸巾别被风吹走 |
A.冰箱温度过低,不适宜种子发芽 |
B.冰箱中没有种子萌发所需要的足够的空气 |
C.冰箱里光线暗淡,不适合种子萌发 |
A.运输 | B.支撑 | C.吸收 |
A.花瓣鲜艳 | B.气味芳香 | C.花蜜甜美 | D.花粉多而轻 |
A.高山寒冷的气候 | B.干旱的沙漠气候 | C.雨水充足的热带沿海气候 |
A.拍手 | B.说话 | C.转动眼珠 | D.吹口哨 |
A.鼓膜 | B.听小骨 | C.耳蜗 |
A.大地 | B.空气 | C.风 |
A.沙子 | B.水 | C.空气 |
A.远离噪音 | B.勿乱挖耳 | C.戴耳机长时间听歌 | D.带耳塞 |
A.①②③ | B.①③⑤ |
C.①②③④ | D.①②③④⑤ |
A.雄蕊 | B.雌蕊 | C.花瓣 | D.花柱 |
A.发芽期 幼苗期 开花期 结果期 |
B.发芽期 幼苗期 生长期 开花结果期 |
C.发芽期 生长期 幼苗期 开花结果期 |
A.②①③ | B.①②③ | C.②③④ | D.①③④ |
A.is waiting | B.are waiting | C.waits |
A.drink | B.to drink | C.are drinking |
A.Two | B.Twice | C.Two times |
A.two glass of water | B.two glass of waters | C.two glasses of water |
A.Good idea. | B.Thank you. | C.Yes, we are. |
A.Ben's bicycle is different from Peter's car. |
B.Ben's bicycle is the same as Peter's. |
C.Ben has a bicycle and Peter has a bicycle, too. |
A.Take care! | B.Be careful! | C.Enjoy yourself! |
A.The cat is running behind the dog. |
B.The dog is running after the cat. |
C.The dog is jumping after the cat. |
A.This is Eric's story-book. |
B.Eric has got a story-book in his hand. |
C.Eric can read the story-book. |
A.He is poor at playing basketball. |
B.He can't play basketball well. |
C.He is a good basketball player. |
A.lakes; rivers | B.lake; river | C.a lake; a river |
A.part of | B.parts of | C.part from |
A./ | B.The | C.A |
A.Whose | B.Who's | C.What's |
A.some | B.a | C.any |
A.beside | B.in front of | C.behind |
A.has; has | B.have; have | C.has; have |
A.How many | B.How much | C.What |
A.In | B.On | C.At |
A.we | B.us | C.our |