题目

Directions: Complete the following passage by using the words in the box. Each word can only be used once. Note that there is one word more than you need. A. adaptable B. advocates C applications D. commercially E. common F. privacyG. mostly H. experiment I. identify J. extraordinary K. tailorsPicture this: You stop in front of a digital advertising display at a mall and suddenly an ad of makeup pops up, followed by one for shoes and then one for vanilla ice cream. It seems to know you're a woman in your late 20s and, in fact, it does. When you look at the display, it scans your facial feature在高温条件下，A、B两种物质可以发生化学反应生成C和D．反应前后分子种类变化的微观示意图如图所示（1）一个A分子中共含有 个原子，B代表的是 （填化学式）．（2）四种物质中，属于单质的是 ，可用作燃料的是 （填图中的字母）．（3）在该反应中，生成C和D的质量比为 ．