问题
单项选择题
依照中石化总公司标准，烧油加热炉的氧含量控制指标为（）。
A、2～3.5%
B、2～4%
C、2～4.5%
D、3～5%
答案
参考答案：D
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依照中石化总公司标准，烧油加热炉的氧含量控制指标为（）。
A、2～3.5%
B、2～4%
C、2～4.5%
D、3～5%
参考答案：D
On a trip to California, my family stopped for lunch. As we walked towards the entrance to the restaurant, a man, with a messy beard and _____ hair, jumped up from a bench outside the restaurant and opened the door for us. Paying no attention to his ______, he greeted us in a friendly way. Once inside, my daughters said in a low voice, “Mom, he _______.” After we ordered our lunch, I explained, telling the the kids to look beyond the dirt. We then watched other _____ come into the restaurant but many took no notice of him. Seeing this rudeness truly ______me. The day I became a mother, I had determined to set a good example to my children. Yet sometimes being a good example was _______, especially when things didn’t go right. After our meal arrived, I realized I had left my car-sick pills in the car, so I went back to the car to get them. Just then, the “doorman”was opening the door for a couple. They ______ him without even noticing his presence. Letting them in first, I said a loud “thank you” to ______ as I went out. When I returned, we talked a bit. He said he was not allowed inside _____ he bought food. I went back and asked our waitress to ______ one soup and sandwich. The kids looked puzzed as they had already eaten. But when I told them his story and said the _____ was for the “doorman”, they smiled. When it was time to continue our ______, I found the “doorman” enjoying his meal. Upon seeing me, he stood up and thanked me heartily with tears in his eyes. Back in the car, I fell into deep thought. While we can’t choose many things in life, we can choose _____ to show gratitude. I said thanks to a man who had _____held open a door for me, and also said thanks for that opportunity to teach my children by _______.
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