Department of Homeland Security and CIA produced ______ joint report on Monday warning that ______ next 911 could in fact occur on ______ different date. A.the; a; the B.a; the; a C./; the; the D.a; /; the 答案:B考查冠词的用法。第一空泛指“一份联合报告”;第二空特指“下次911事件”;第三空泛指“一个不同的日期”。 某同学做电学实验,通过改变滑动变阻器的电阻大小,测量并记录了多组电压表和电流表的读数,根据表格中记录的数据分析,他所连接的电路可能是电路图中的哪一个?( )U/V0.60.70.80.91.01.1I/A0.180.210.250.270.300.33A.B.C.D.