-Whocleaned the classroom?It's so clean．-I'm not sure．Go and ask Jim．题目和参考答案——青夏教育精英家教网—

题目内容

12．-Whocleaned（clean） the classroom？It's so clean．-I'm not sure．Go and ask Jim．

分析 --谁打扫的教室？很干净．
--我不确定，去问问吉姆吧．

解答答案：cleaned．
根据"It's so clean"很干净．此处的it指的是classroom，也就是说教室很干净，从逻辑上来讲，教室打扫了以后才会很干净，所以要用一般过去时来填空，结合给出的单词提示clean，所以这个句子的意思是"谁打扫的教室？很干净．"综上所述，故填cleaned．

点评首先要掌握这个句子的意思，然后结合具体的题目，就可以确定正确答案．

练习册系列答案

3．If you want to learn English well，you shouldpractice （操练）more．

20．从那时起，我再也不害怕喂大象了．From then on，I wasn't afraid of feeding elephants any more．．

7．A charity show was held by thestudents' （student） Union last week．

17．Tim is a funny boy．He often makes us （　　）

4．My father bought me a new book..（改为否定句）
My fatherdidn't buy me a new book．

1．Can your best friends keepsecrects for you？（秘密）

2．In the 19th century，trains were the best way to travel long distances（距离） over land．Trains were fast and convenient．In the 20th century，airplanes replaced trains for long-distance travel．Today，however，high-speed trains are attracting （吸引）passengers again．
France has a train called the TGV．TGV is"Train a Grande Vitesse"in French，which means"high-speed train"．A TGV train operates at speed up to 300km/h．The passengers can travel from Paris to Marseilles in only four hours．
The first country to have a high-speed train is  Japan．The Bullet train offers a fast，smooth  ride between Tokyo and other major cities in Japan．This train operates at speed up to 210km/h  and can travel between Tokyo and Osaka in just three hours．
China has the worlds longest high-speed rail network with over 19，369.8km of  track （轨道） in service from December 2014．China's high-speed  rail system also includes the world's longest  line，the 2.298km Beijing-Guangzhou high-speed railway．China's high-speed trains  are marked with"CRH"（China's railway high-speed）．They are also called  Hexie Hao．The fastest trainsets，CRH380BL，reached the highest test speed of 487.3km/h．
根据短文内容，选择最佳答案．
56．What does the underlined phrase"at speed" in the second paragraph mean．A
A．fast
B．late
C．slowly
D．deeply
57．The first country to have a high-speed train isB．
A．China
B．Japan
C．France
D．America
58．which is the world's longest high-speed railway line？C
A．The line from Beijing to Shanghai．
B．The line from Paris to Marseilles．
C．The line from Beijing to Guangzhou．
D．The line from Tokyo to Osaka．
59．The highest test speed of GRH380BL wasB．
A.210km/h
B．over double the speed of the Japanese Bullet train．
C.300km/h
D．more than double the speed of the  French TOV train．
60．What's the main idea of this passage？D
A．The development of the French TGV  train．
B．The history of the Japanese Bullet  train．
C．The tests of the Chinese CRH380BL trainsets．
D．The introduction of high-speed trains．

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