第13题: [单项选择]The most inefficient method of voltage reduction from the stand point of power loss, is a/an () A. capacitor in series with the load B. inductor in series with the load C. capacitor and inductor in series with the load D. resistor in series with the load 参考答案:D
第31题: [单项选择]It is obviously desirable that the school authority ______ awareness of the physical risks of sexual activity. A. fostered B. fosters C. foster D. will foster 参考答案:C 答案解析:该句中包含有desirable这个表示“心理期待”语义的形容词,主语从句中必须用虚拟语气,动词形式用should+动词原形,且助动词should通常省略。