问题
单项选择题
在压力不变的情况下，气体的密度随温度的上升而（）。
A、上升
B、下降
C、不变
D、先下降后上升
答案
参考答案：B
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在压力不变的情况下，气体的密度随温度的上升而（）。
A、上升
B、下降
C、不变
D、先下降后上升
参考答案：B
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| My father was raised in a fatherless home at a time when the family of five struggled to survive, which caused my father to be extremely tightfisted (吝啬) with money. When we children became 1 that other children got pocket money from their parents, we made a(n) 2 to ask our father for some. Immediately his face turned stone-cold, and he said, "If you're old enough to ask, you're old enough to 3 ." And we had to seek odd jobs about the neighborhood. He didn't 4 his attitude as we grew into adulthood. There was a time when 5 of us had a car, so we had to ride a 6 whenever we came home. Though the bus stopped about two miles from home. Dad never met us, 7 in bad weather. If someone 8 (and my brothers did a lot), he'd say in his 9 father-voice, "That's what your legs are 10 !" One spring evening I was on the bus home from 11 . Tests and long hours in labs had 12 me exhausted. As other students were 13 at their stops, I looked silently out of the window. Finally, the bus came to a 14 at my destination, and I 15 , carrying my suitcase to begin the long journey home. The row of privet hedge (树篱) came into 16 , which lined the driveway that climbed the hill to our house. I stopped to put a book in the suitcase. When I stood up, I saw something gray 17 along the top of the hedge toward the house. It was the top of my father's head, I 18 . Then, each time I came home, be would stand behind the hedge, watching, 19 he knew I had arrived safely. I held back my tears. He did care, 20 . Upon reaching home, I found my father sitting innocently in his chair. "So! It's you!" he said, his face lengthening into surprise. | ||||
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