21. Scientists are convincedthe positive effect of laughter_____physical and mental health.
A. of, at B. by, in C. of, on D. on, at
22. Alcohol is also classified as a downer, and though it is legal, it can damage the liver and do great harm if ________ in large quantities.
A. consume B. to consume C. consuming D. consumed
23. Betty shows great interest in this poem now, but she thought it boring _______ she read it.
A. at the first time B. the first time C. for the first time D. at first
24. The number 2008 is a special number, ________ I think, that will be remembered by the Chinese forever.
A. which B. what C. one D. it
2014人教新目标英语七下unit 3《How do you get to school》（第2课时）section a 2a-2d导学案
2014人教新目标英语七下unit 3《How do you get to school》教案4
2014人教新目标英语七下unit 3《How do you get to school》学案3
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2014人教新目标英语七下unit 3《How do you get to school》教案6
2014人教新目标英语七下unit 3《How do you get to school》（第4课时）section b 1a-1e导学案
2014人教新目标英语七下unit 3《How do you get to school》教案
2014人教新目标英语七下unit 4《Don’t eat in class》（第四课时）教案
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2014人教新目标英语七下unit 3《How do you get to school》教案3
2014人教新目标英语七下unit 4 《Don’t eat in class》（第1课时）学案
2014人教新目标英语七下unit 3《How do you get to school》学案5
2014人教新目标英语七下unit 3《How do you get to school》（第1课时）section a 1a-1c导学案
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2014人教新目标英语七下unit 4《Don’t eat in class》period 2教案
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2014人教新目标英语七下unit 2《What time do you go to school》单元练习题1
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2014人教新目标英语七下unit 4《Don’t eat in class》period 1教案
2014人教新目标英语七下unit 3《How do you get to school》学案1
2014人教新目标英语七下unit 4《Don’t eat in class》（第二课时）导学案
2014人教新目标英语七下unit 4《Don’t eat in class》（第一课时）教案
2014人教新目标英语七下unit 4 《Don’t eat in class》（第4课时）学案
2014人教新目标英语七下unit 4《Don’t eat in class》（第6课时）section b 3a-self check导学案
2014人教新目标英语七下unit 3《How do you get to school》教案2
2014人教新目标英语七下unit 4《Don’t eat in class》（第三课时）教案