1、 【精品】Unit6 Lesson20 练习及解析北京课改版四年级英语下册一、按要求写单词。1.safe(名词)_ 2.be afraid (汉语)_3. this afternoon（汉语）_ 4.thick (反义词)_5. dangerous(反义词)_【答案】1.safety 2. 恐怕 3. 今天下午 4. thin 5. safe【解析】1.safe 的名词是 safety2.be afraid 恐怕3.this afternoon 今天下午4.thick(厚的) 的反义词是 thin(薄的)5. dangerous(危险的)的反义词是 safe(安全的)二、根据句意及首字母填写单
2、词。1.Can I s_ here this afternoon?2.Im a_ not.3.The ice is not thick e_.4.Watch out for your s_.5. Its d_ to skate on thin ice.【答案】1. skate 2.afraid 3.enough 4.safety 5. dangerous【解析】1. 今天下午我可以在这里滑冰吗？skate 滑冰。2. 恐怕不行。be afraid 恐怕。3. 冰不够厚。enough 足够的。4. 注意你的安全。safety 安全。5. 在薄冰上滑冰是危险的。dangerous 危险的。三、单项
3、选择。1. You can fall _the water.A. into B. in C. to2. Can I _here this afternoon?A. skate B. to skate C. skating3. Its dangerous _on thin ice.A. to skate B. skate C. skating4.Watch out for your _.A. safe B. safety C. safely5. Why not _your kite here?A. to fly B. fly C. flying【答案】1.A 2. A 3. A 4. B 5.
4、B【解析】1. 此句意是：你会掉进水里的。fall into 掉进。2.此句意是：今天下午我可以在这里滑冰吗？在情态动词后跟动词原形 skate。3.此句意是：在薄冰上滑冰是危险的。此句 It 是形式主语，真正的主语是后面的不定式短语，Its dangerous to do sth.做某事是危险的。应选 A。4.此句意是：注意你的安全。safety 安全，名词。应选 B。5. 此句意是：为什么不在这里放风筝呢？Why not 后跟动词原形，意为：为什么不呢？四、根据句意，选词填空。fly afraid dangerous into out1Im _not.2. You may fall _th
5、e water.3. Its _to skate on thin ice.4.Watch _for your safety.5. Please dont _your kite here.【答案】1.afraid 2.into 3.dangerous 4.out 5. fly【解析】1. 此句意是：恐怕不能。be afraid 恐怕。2. 此句意是：你可能会掉进水里。fall into 掉进。3. 此句意是：在薄冰上滑冰是危险的。dangerous 危险的。4. 此句意是：注意你的安全。watch out 注意，小心。5. 此句意是：请不要在这里放风筝。fly your kite. 放风筝。五、
6、根据要求完成句子。1. Can I skate here this afternoon? (做否定回答)_2. The ice is not thick enough. (写出同义句)_3.It is dangerous to skate on thin ice.(写出同义句)_4. You can go swimming in the river.(对画线部分提问)_5.I, cross, can, the, street(?)(连词成句)_【答案】1.No, you cant.2.The ice is thin.3.It is not safe to skate on thin ice.4
7、. Where can I go swimming?5. Can I cross the street?【解析】1.此句做否定回答时要注意将第一人称的 I 变为第二人称的 you, 应为 No, you cant.2.此句意是：冰不够厚。与之意思相近的是 The ice is thin.3 此句意是：在薄冰上滑冰是危险的。与之意思相近的是 It is not safe to skate on thin ice.4. 此句画线部分是 in the river，所以提问时要用 Where, 另外要将第二人称的 you 变为第一人称的 I。5.根据所给词可组成句子为：Can I cross the
8、street?我能穿过街道吗？六、根据对话内容判断正误，对的用 T，错的用 F。Mary: Mum, can I skate here this afternoon?Mum: Im afraid not. Its dangerous. You may fall into the water.Mary: Why ?Mum :Its getting warm. The ice is not thick enough.Mary: Its dangerous to skate on thin ice.Mum: Thats right. Watch out for your safety, Mary.(
9、 )1. Mary wants to skate this afternoon.( )2. The ice is not thin enough.( )3. Its not safe to skate on thin ice.( )4. Mum is afraid she will fall into the water.( )5.Watch out for your safety.【答案】1. T 2.F 3.T 4. T 5.T【解析】1. 根据对话中 Mary: Mum, can I skate here this afternoon?可判断此句是正确的。2. 根据对话中 The ice is not thick enough.可知此句是错误的。3. 根据对话中 Its dangerous to skate on thin ice.可知此句是正确的。4. 根据对话中 Mum: Im afraid not. Its dangerous. You may fall into the water.可判断此句是正确的。5.根据对话中 Watch out for your safety.可判断此句是正确的。
