题目

下列关于脂质的叙述，正确的是                                      (     ) A．脂质是生物体的重要组成成分，含量仅比水少 B．所有的脂质是由C、H、O三种元素组成的 C．脂质主要包括脂肪、磷脂和胆固醇三大类 D．脂质有个共同特征是不溶于水 答案：D Once there were several s 【1】 in a forest. They were trying to study the rarest animal in the world. No one had seen it,so everyone was 【2】 (excite) and wanted to be the 【3】 (one) one to photograph and study it.The animal only came out at night,【4】 the scientists did some other studies in the day. Among them,there was a famous scientist named Walter. Every day,he would spend an hour 【5】 (sit) at the desk and putting all his 【6】 (设备) in the right place. He did this carefully. But other scientists laughed at him because they thought Walter was just wasting time.One night,the animal a 【7】 suddenly. The scientists h【8】 its call. But the call didn’t last long. The animal was 【9】 (fright) by the noises 【10】 (make) by the scientists while they were scrabbling (忙乱地找) for their cameras and notebooksO【11】 the next morning,the scientists compared their findings. Some bad tied to record its call,o【12】had noted down how it moved,and the 【13】 (luck) one had e【14】 photographed parts of its tail and legs. They all congratulated each other what they had found. However,when they saw w【15】 Walter had,they were very 【16】 (surprise) . He had t【17】 several complete (完整的) photos,the record of the 【18】 (animal) cry and notes about the animal.They ran to congratulate Walter. They now understood the 【19】 (important) of keeping things in o【20】. Because of that,Walter could find everything quickly in the dark.