下列物质的分类正确的是（ ）
| 碱 | 酸 | 盐 | 碱性氧化物 | 酸性氧化物 | |
| A | NaOH | H2SO4 | BaCO3 | SO2 | CO2 |
| B | 纯碱 | H2S | 石灰石 | SiO2 | CO |
| C | NaOH | NaHSO4 | CaCl2 | Na2O | SO2 |
| D | KOH | HNO3 | CaCO3 | CaO | SO3 |
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Back in 2007, I rented（租） a room in Johor Bahru, Malaysia while studying for my Masters programmed（硕士课程） in Singapore. I travelled daily by 36 across the Johor- Singapore Causeway(穿越湿地的堤道) for my 37 , which were usually in the evening. It was quite 38 by the time I got back to the bus station in Johor Bahru, and I would still need to take another bus home. One night, I 39 the last bus and didn’t have enough money to take a taxi. With no other choice, I decided to 40 the two-kilometer journey home, which would have been fine 41 I were not so tired that day. It also didn’t 42 that the route was pretty rough（凹凸不平的）and dark. But I walked forward with 43 , with the promise of a night’s rest 44 me on. After walking for a few minutes, a car 45 in front of me. The driver, who looked 46 , asked where I was headed. “Not many people walk through here,” he said, and 47 me a ride. He really 48 me up as he went out of his way to get me to my apartment. What was more 49 , however, was the story behind it. During the ride, the driver told me that when he saw me walking, it made him think of his 50 who used to walk to work by the 51 road and though he often saw his uncle on the way, he had 52 offered a ride as he was headed in a different direction. 53 his uncle passed away because of an illness, and until today he still feels 54 for not being kinder to his uncle. So when he 55 me walking that night, he just had to stop and help.
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一般空冷器的设计气温要求低于（）K。
A、188
B、208
C、288
D、308
引起痴呆的疾病最主要是
A．阿尔茨海默病
B．Pick病
C．血管性痴呆
D．酒精性痴呆
E．脑外伤痴呆
网络贸易机会与风险并存，一旦受骗，应及时采取应对策略。专家的建议是（）
A.保留所有交易过程中的一切资料
B.到当地公安局报警，将公安机关的立案证明或者法院的立案通知书签字盖章的复印件提供给阿里巴巴
C.到诚信论坛进行投诉，写明事情发生经过
D.只能自认倒霉
立德粉常被用于制备（）。
A、罩光面漆
B、光固化涂料
C、清漆
D、底漆