问题
填空题
主要分布于淡水中的羽纹硅藻纲分为5个目，其中最常见的是（）目，（）目，（）目，（）目，（）目。
答案
参考答案：无壳缝；单壳缝；短壳缝；双壳缝；管壳缝
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主要分布于淡水中的羽纹硅藻纲分为5个目，其中最常见的是（）目，（）目，（）目，（）目，（）目。
参考答案：无壳缝；单壳缝；短壳缝；双壳缝；管壳缝
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| Last Tuesday I took my two daughters, aged five and seven, to town by car. It began to rain __1__ so I decided I would leave the children in the __2__ before I rushed into a shop. I warned the girls not to __3__ anything and told them I would be back within a few__4__. Then I locked all the doors and __5__ them happily looking out of the window. I returned to the car in less than five minutes but the girls had __6__! I could hardly believe my __7__. The car doors were __8__ locked, the windows tightly shut and in the back seat __9__ only two coats. Being __10__, I ran to the corner of the street __11__ there was no sign of them. I __12__ up to an old lady nearby and asked __13__ she had seen two small girls but she said "No". Feeling quite sick with __14__, I sat on the driver's seat, and tried to stop trembling. Suddenly, I __15__ a merry laugh behind me. I got out of the car, ran round to __16__ the boot and there inside were two very red-faced and excited __17__. They had obviously pulled out the back seat, __18__ behind it and then been unable to push the __19__ forward again. With tears in my eyes, I leaned forward and __20__ their ears. | ||||
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