第21题: [单项选择]A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a () A. defective solenoid valve B. dirty fuel nozzle C. grounded high tension lead D. faulty ignition cable connector 参考答案:B
第27题: [填空题]The most (effect)()ways of losing weight are exercising more and eating balanced meals. 参考答案:effective 答案解析:
本题考查形容词的用法。本句的主语是ways,而主语中心词之前需用形容词修饰作定语,而括号中的 effect是动词,因此必须转化成形容词。
[答题指南] effective的意思是