—If a="4," b="5," what’s the answer to the question “ a + 2ab +1 =?”   —     .

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—If a="4," b="5," what’s the answer to the question “ a + 2ab +1 =?”   —     .

题型：不详难度：来源：
—If a="4," b="5," what’s the answer to the question “ a + 2ab +1 =?”
   —     .
A．Forty-fifthB．Forty-five
C．Twenty-threeD．One hundred and twenty-one

答案
B
解析
略
举一反三
Eight         students in our school are from countryside.
A  hundreds    B  hundred   C hundreds of   D   hundred of
题型：不详难度：| 查看答案
The river is very long and it is about      .
A．20 metres wideB．15 metres longC．30 metres highD．50 metres tall

题型：不详难度：| 查看答案
My father will have a      holiday next month. He’ll take me to Qingdao.
A．ten days B．ten day’s C．ten-days D．ten days’

题型：不详难度：| 查看答案
--Do you have enough students to clean the laboratory?  
--No, I think we need____________ students.
A．anotherB．two othersC．more twoD．two more

题型：不详难度：| 查看答案
More than _____children took part in activities last month.
A．two thirdsB．thirds secondC．second threeD．two third

题型：不详难度：| 查看答案
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