题干

为了探究酵母菌的呼吸作用类型,某同学将实验材料和用具按下图安装好.以下关于该实验的说法,错误的是(  )

A:甲组探究酵母菌的有氧呼吸,乙组探究酵母菌的无氧呼吸

B:甲、乙两组中澄清的石灰水都变浑浊,乙组浑浊程度更大

C:加入质量分数为10%的NaOH溶液是为了吸收空气中的CO2

D:乙组B瓶应封口放置一段时间后,再连通盛有澄清石灰水的锥形瓶

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答案(点此获取答案解析)

B

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    When I spent the summer with my grandmother, she always set me down to the general store with a list. Behind the counter was a lady like no one I'd ever seen.

    “Excuse me,” I said. She looked up and said, “I'm Miss Bee.”

    “I need to get these.” I said, holding up my list. “So? Go get them. ” Miss Bee pointed to a sign. “There's no one here except you and me and I'm not your servant, so get yourself a basket from that pile.”

    I visited Miss Bee twice a week that summer. Sometimes she shortcharged me. Other times she overcharged. Going to the store was like going into battle. All summer long she found ways to trick me. No sooner had I learned how to pronounce “bicarbonate of soda” and memorized its location on the shelves than she made me hunt for it all over again. But by summer's end the shopping trip that had once taken me an hour was done in 15 minutes.

    “All right, little girl,” she said. “What did you learn this summer?” “That you're a meanie!” I replied. Miss Bee just laughed and said, “I know what you think of me. Well, I don't care! My job is to teach every child I meet life lessons. When you get older you'll be glad!” Glad I met Miss Bee? Ha! The idea was absurd…

    Until one day my daughter came to me with homework troubles. “It's too hard,” she said. “Could you finish my math problems for me?”

    “If I do it for you, how will you ever learn to do it yourself?” I said. Suddenly, I was back at that general store where I had learned the hard way to add up my bill by myself. Had I ever been overcharged since?