题目：
| Cloze test. | ||||
| This is a true story about something that happened between a customer of General Motors and its Customer- Care Executive (客服主管). The following complaint was received by General Motors "...It may sound crazy, but it's a fact that every time I buy a 1 ice cream, and come back from the store, my car won't start. If I get any other kind of ice cream, the car starts 2 fine. Why?" The executive was 3 about the letter, but sent an engineer to check it out anyway. The 4 made three visits to the store with the customer. The first time, he got chocolate ice cream. The car started. The second time, he ordered strawberry. The car started. The third time he got vanilla. The car failed to start. The engineer 5 to believe that the man's car was allergic (过敏的) to vanilla ice cream. He 6 his visits, and noted all sorts of data: the types of gas used and the time it took to drive back and forth. Soon he came a clue: it took the man less 7 to buy vanilla than any other flavor (味道). Why? The answer was in the layout (布局) of the store. Vanilla, as the most 8 flavor, was in the front of the store for quick pickup. All the other flavors were kept further back, where it took longer to buy them. Time was now the 9 not the vanilla ice cream! The engineer quickly put forward an answer:"engine trouble." The extra time taken to get any other flavor 10 the engine to cool down longer. When the man got vanilla, the engine was still too hot to start. Even crazy-looking problems can be real. What really 11 is your attitude to the problem. Don't just say something is "IMPOSSIBLE" without putting a sincere effort into 12 it out. If you look closer, you may discover that it's possible after all. | ||||
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答案：C题目分析：A选项，浓硫酸具有脱水性，可使蔗糖脱水生成炭黑，故A正确；B选项，浓硝酸见光分解生成红棕色气体NO2，溶于硝酸，溶液呈黄色，故B正确；C选项浓硝酸与铝发生钝化，在表面生成一层致密的氧化物膜...
