Unit3 Fun Time课时训练一、补全单词。1. w_ _m2. f_ _th_r3. w_ng4. e_ _5. b_ _ _d6. t_ _l7. i_s_ct8. s_ak_二、选词填空。（每词限用一次）from to with than only All(1) Mammals are covered _ hair or fur.(2) Mother mammals feed milk _ their babies.(3) The fish is smaller _ that one.(4) It is _ a bird.(5) _ insects have six legs.(6) Li Sa walked home _ school one day.三、翻译句子。1. 哺乳动物用奶喂他们的幼崽。_2. 所有的鸟有羽毛。_3. 蛇是一种没有腿的爬行动物。_4. Most insects can fly._5. Mother reptiles lay eggs._参考答案一、1. warm 2. feather 3. wing 4. egg 5. blood 6. tell 7. insect 8. snake二、(1)-(6) with; to; than; only; All; from三、1. Mother mammals feed milk to their babies.2. All birds have feathers.3. A snake is a reptile with no legs.4. 大部分昆虫会飞。5. 母爬行动物会下蛋。