题目

下列说法正确的是（） A . 含有一种元素的物质是单质 B . 地球富含水，所以水资源取之不尽，用之不竭 C . 带有电荷的粒子都叫作离子 D . 自然界的元素大多数是以化合物形式存在 答案：D根据对话情景和内容，从对话后的选项中选出能填入每一空白处的最佳选项，选项中有两项为多余选项。注意：E涂AB     F涂AC    G涂AD —  What seems to be the problem? —       6     —  How long have you been like this? —  Since Saturday night. —  ____ 7     —  Yes, I also feel lighthearted. —  Can you think of anything you ate Saturday that might have caused it? —  All I can think of is the fish I had. It didn’t taste quite right. —  ____ 8      Now I’ll give you some medicine. Take it and you should be feeling better soon. —  ____ 9     —  I also suggest that you follow a special diet. —  ____10     —  You should stick to eating lighter foods. A.     What’s that? B.      That might be it. C.      Thank you, doctor. D.     Any other problems? E.      I have a running nose. F.      Have you seen a doctor? G.     I have a terrible stomachache.