皮皮学，免费搜题
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【简答题】
听下面一段材料，回答第1-4小题。 1. How many persons were there in the room when someone was knocking at the door? [ ] A. One person. B. Two persons. C. Three persons. 2. What did the young man wear? [ ] A. A white shirt. B. A pair of glasses. C. Long trousers. 3. Who was the young man? [ ] A. He was a friend of the writer's. B. He was a friend of the writer's brother's. C. He was a strange man to them. 3. What was probably the end of the story? [ ] A. The young man was taken away by the police. B. The young man became their friend. C. The young man ran away.
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】SEM(搜索引擎推广)是指卖家通过对商品相关关键词出具一定的竞价价格,获得靠前搜索排名的商品推广方式。其中向搜索引擎提供方是如何计算付费:
A.
按单次点击付费，并设置付费总额。
B.
按单次展现付费，并设置付费总额。
C.
按时间付费，并设置付费总额。
D.
仅设置付费总额。
【判断题】速卖通直通车是阿里巴巴全球速卖通平台会员通过自主设置多维度关键词,免费展示产品信息,通过大量曝光产品吸引潜在买家,并按照点击付费的全新网络推广方式。
A.
正确
B.
错误
【简答题】下图 是细菌鞭毛的结构图,请在图上空格处写出相应部位的名称。