题目内容
8．Thousands of tourists visit this park every year．（改为被动语态）This parkis visitedby thousands of tourists．
分析 每年都有成千上万的游客来参观这个公园．这个公园每年被成千上万的游客参观．
解答 答案：is visited 分析原句，意思是每年都有成千上万的游客来参观这个公园，这是一个一般现在时的主动语态，下句this park是句子的主语，即动作的承受者，故用被动语态，时态要与上句保持一致，故用is visited．
点评 当句子的主语是动作的执行时，谓语的形式叫主动语态；当句子的主语是动作的承受者时，谓语的形式叫做被动语态．构成："助动词be+过去分词"主动词be有时态、人称和数的变化，也可以构成否定或疑问句．
练习册系列答案
相关题目
18．-Did you do anything interesting last Sunday？
-Not really．I just at home．（ ）
-Not really．I just at home．（ ）
| A． | stay | B． | stayed | C． | will stay | D． | am staying |
19．-Would you please help me move this desk？
- （ ）
- （ ）
| A． | Of course not． | B． | Certainly． | ||
| C． | I agree with you． | D． | I am OK． |
16．I know the lady is singing over there．She is our Chinese teacher．（ ）
| A． | which | B． | who | C． | whom | D． | whose |
3．Playing too many computer games is bad for our eyes．（ ）
| A． | is harm to | B． | is injured for | C． | is badly to | D． | is harmful to |
13．
71．Trees can help protect the environment in many ways，because they arepollutionfighters．
72．The Shenzhou XI spaceship returned to the Earthsuccessfully．
73．This beautiful skirtbelonged tomy sister，my mother bought it for her 2 years ago．
74．Don't give up，even though we have failed twice．Let's have athirdtry．
75．Themeaningof this sentence is not clear to me．
| pollute success belong to return to three mean mind |
72．The Shenzhou XI spaceship returned to the Earthsuccessfully．
73．This beautiful skirtbelonged tomy sister，my mother bought it for her 2 years ago．
74．Don't give up，even though we have failed twice．Let's have athirdtry．
75．Themeaningof this sentence is not clear to me．
17．Seeing a bird resting by the window，the boy moved _____to have a look at it．（ ）
| A． | politely | B． | quietly | C． | easily | D． | safely |
On May 5th，2017，at Shanghai Pudong International Airport，China's first large homemade jet airliner（喷气式客机），the C919，took off successfully for the first time．It has taken about ten years for the scientists and researchers to make this Chinese dream come true，It's a pride of the whole nation．So far，more than 23 companies have already ordered 570 C919 planes from China．But we still have a long way to go before the C919 carries passengers by 2020．It also faces the challenge of 
What's more，China is working on the new high-speed trains with the highest speed of 400km/h．It will be ready by 2020．The new trains are expected to push area cooperation（合作） and create new business for China and foreign countries．Many countries，especially the ones in Central Asia，Southeast Asia，the Middle East and Eastern Europe，are planning to build high-speed rail lines or to improve their railways with the help of China．They'd like to get support in technology from China．