I go grocery shopping nearly every day. That day I was trying desperately to find a good tomato. I finally grabbed the best one I could find. Backing away from the counter with it in hand. I wasn't paying attention. “Oh, I'm so sorry!” I said as I nearly fell over a woman in an electric cart. Many stores have started providing electric cars for those who have difficulty getting around. “Oh, that's okay. I'm used to it. they need to put horns(喇叭)on these things,” she said with a smile. “We are positioned a bit lower and somewhat out of view. They are also so quiet that often people just don't hear us coming. But I don't know what I'd do without one. Oh, what a beautiful tomato it is ! I used to grow tomatoes. But this year I just couldn't do it any more.”

    “I'm sorry for your challenges. It must be frustrating.” I said.

    “Well, it all requires a change in attitude, I could spend my time thinking about what I can't do any more, or spend it on what new things I can do. I loved gardening. Besides my vegetable I also planted many flowers. All those years of love and attention kept them strong, so my work paid off,” the old woman replied.

    “I love your attitude,” I added. “But tell me, what new things have you discovered? You said you needed to focus on new things you could do.” “Well, I can go to the grocery store and make new friends by running into perfect strangers with my cart,” she said. “What I've discovered is that I can't grow flowers any more, but I can paint flowers. When I hang my flowers paintings on the wall, the fresh scent stays in my soul. Since I can't get around as much and they are just there, we are a perfect match.”

    “Just like meeting you, my friend. You added beauty to my day and will brighten the dark corners of my memory just when I need it most,” I told her.

人的体细胞中有46条染色体，1个体细胞连续分裂3次，可得到____ 个子细胞，每个子细胞中含有____ 条染色体．

在“研究串联电路电压的特点”实验中，小阳同学设计并连接了如图所示的电路，其中小灯泡L的额定电压为10V，电压表、电流表均选择了合适的量程且能正常使用。

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