Relatively little is known about rough­toothed dolphins，which are usually found in deep and warm tropical waters.

　　5．Haifa Bay is full of harmful chemicals which are caused by

　　.

　　A．unhealthy fish

　　B．ships

　　C．chemical companies

　　D．residents living nearby

　　答案　C

　　解析　细节理解题。由第四段第一句可知这些有害的化学物质是化工厂排放到水中去的。

　　6．Aviad Sheinin’s words suggest

　　.

　　A．he was curious about the dolphins

　　B．the dolphins might affect the existence of fish in Haifa port

　　C．he would research on the dolphins

　　D．he would be uncertain about what will happen to the dolphins

　　答案　D

　　解析　推理判断题。由第三段第二句“...he didn’t think...but that he hoped...”可推知。

　　7．When learning the dolphins entered Haifa port，hundreds of Haifa residents

　　.

　　A．were curious

　　B．felt upset

　　C．went to drive them away

　　D．were shocked

　　答案　A

　　解析　细节理解题。由倒数第二段首句“Hundreds of Haifa residents gathered around Haifa Bay to see...”可知当地的居民们很好奇，都跑去观看。

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