喷泉的给水方式主要有（）等形式。
A、直流式供水
B、水泵循环供水
C、高位水体供水
D、枯水方式供水
参考答案：A, B, C
— _____ I hand in my report as soon as the class is over?
— No, you needn't. Anytime this week is okay. [ ]
A. May
B. Must
C. Shall
D. Can
哈工程有（）位新世纪优秀人才支持计划入选者。
A.12
B.18
C.15
D.17
