题目

Farmers stored up a great _____ of wheat and a _____ of beans this year. A. number; lot    B. deal; number C. plenty; lots     D. deal; pack 答案：B 解析: 略6．如图，四边形ABCD是菱形，AC=8，BD=6，DH⊥AB于H．求（1）菱形ABCD的周长；（2）求DH的长．