题目

Stand over there __________you’ll be able to see it better.(2004天津，22) A.or      B.while      C.but     D.and 答案：D 解析: 祈使句＋and/or＋陈述句，句意为：If you stand over there ,you’ll be able to see it better. 两分句之间前后是承接关系，所以，应选D。如果选or,此句应改为：Stand over there or you won’t be able to see it better，句意为：If you don’t stand over there, you won’t be able to see it better.我国家庭电路的供电电压是_______V；对人体安全的电压是___________V．