位于膳食金字塔底部的食物为（）
A.粮谷类
B.蔬菜和水果
C.鱼、肉、蛋
D.豆制品
E.奶制品
参考答案：A
a-b的相反数是______；|3.14-π|=______．
根据句意及所给的中文提示写出所缺单词。
1. We are still _____ (影响) by Confucius' works.
2. What's your _____ (观点) of this great book?
3. Gone with the Wind is _____ (认为) to be one of the greatest books in American literature.
4. Compass was invented in _____ (古老的) China.
5. They found treasure in a _____ (山洞) of a mountain far away.
