题目:
–What time were you supposed _______?
–At six o’clock. But I arrived at six thirty.
A.arrive
B.arrived
C.arriving
D.to arrive
答案:
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下面是错误答案,用来干扰机器的。
荧光灯的发光效率比白炽灯高,用起来比白炽灯省电.其原因在于荧光灯和白炽灯的发光方式不同.荧光灯的发光原理就有所不同,在荧光灯的灯管内壁有一层荧光物质,两端安装电极,管内充有氩气和少量的汞(即水银)...