第4题: [单项选择]The low-lying areas refer to those regions that ______. A. close to the ground level B. one-storey flat C. flat houses D. near to the lowest level of hurricane 参考答案:A 答案解析:low-lying areas主要是指“地势低平的地区”,B、C是指一层平房,主要是强调房子低矮,所以A比较恰当。
第9题: [单项选择]A spark arrestor(). A. keeps sparks from falling into an open tank B. secures covers on ullage openings C. prevents sparks from getting out of an enging's exhaust system D. grounds static electicity 参考答案:C