[多项选择]Which of the following is an equation of a line that is perpendicular to the line whose equation is 2x+3y=4 Indicate all such equations. A. 3x+2y=4 B. 3x-2y=4 C. 2x-3y=4 D. 4-3x=-2y E. 4+2x=3y
A. Free primary and secondary education B. Free health care C. Free social services D. Free tour to foreign countries 参考答案:D 答案解析:[试题分析] 本题应该根据课文内容采用排除法来解答。 [详细解答] “It has free primary and secondary education,free health care a
第22题: [单项选择]I______to catch the 2:00 plane, but no such luck. A. have hoped B. hope C. hoped D. had hoped 参考答案:D 答案解析:[解析] 本题考查虚拟语气的用法。句中所隐含的条件即“要是我能乘坐两点的班机”,而实际结果却是“没有这运气(没赶上)”,说明这个条件是一个虚拟条件,亦即说话人情愿发生却未能发生的事情。类似的同有pla