【名词&注释】
化学反应(chemical reaction)、质量比(mass ratio)、在海上
[单选题]现将10gA和足量B混合加热，A与B发生化学反应，10gA完全反应后生成8gC和4gD，则参加反应的A与B的质量比是（ ）
A. 1：1
B. 2：1
C. 4：1
D. 5：1
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举一反三：
[单选题]29．The skirt is________
A. ￥15
B. $15
C. red and white
D. Band C
[单选题]一艘轮船在海上遭遇风暴沉没，它从开始下沉到完全没入水中前，所受到的浮力变化情况是
A. 增大
B. 不变
C. 减小
D. 无法判断
[单选题]BMy name is Tom Mallory． I'm English and I'm 13． I'm a student in Brookes School． I like music and sports very much． I can play twoinstruments :the violin and the piano． I can play them very well．
A. They are students， too． Our parents are from Ireland， but they live in London now． My mother is a teacher and my father is the manager of a small en-gineering company．
B. Tom lives in________
C. Ireland
D. England
E. Canada
F. America
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