题干
选词填空
根据语篇内容，用方框中所给词的正确形式填空，使短文通顺、连贯。
old, shoe, stand, foot, pick, small, feel, clear, need, use |
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One day, while I was sitting in my car in a parking area,I noticed a young boy in front of my car. “What is the boy doing?” I asked myself and looked closely. “Oh, he is ____up a coin from the ground.”When he ____up, we saw each other ____.He was not ____ than ten and was wearing one blue glove (手套) and one brown glove. His coat was too ____for him.
As he walked away, I saw his ____, which were too old to wear. I rolled down my window and called him over. I asked him if he ____some money. He replied, “No.That's okay.”
The parking area was wet. I could tell that his____were cold because he kept moving his weight from one foot to the other.
“Please,” I held out a five-dollar bill(钞票). “It's not much, but when the money is shared, it is much more ____,” I said.
He took off one of his gloves and took the money from my hand. His small hand was red and cold.
He smiled and went away after saying “Thank you!”to me. That smile made me ____warm in the cold winter.
速度由左边界的O1点射入磁场、电场区域，恰好沿直线运动到区域右边界的O2点（图中未标出）穿出。若保
持磁场强弱、方向和电场方向不变，只增大电场强度大小，另一个同样的粒子b（不计重力）仍以相同初速度由O1点射入，仍然能
够从区域右边界穿出，则粒子