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
一年级英语下册Unit2 Small animals第三课时教案
一年级英语上册教案Unit1 My classroom第一课时教案
上海版牛津一年级英语教案Unit8 Playtime（总五课时）
新起点小学一年级英语下册Unit11 Toys教案
一年级英语教案Module1 unit6 Mid-Autumn Festival
上海牛津版一年级英语下册教案Unit9 Revision(3)
牛津版一年级英语上册Unit 2 Good morning 教案
一年级英语上册教案Unit1 My classroom第一课时
沪教版小学英语一年级下册教案unit1单元分析
沪教版小学英语一年级下册教案unit1课时1