题目

阅读短文,根据短文内容回答问题。  There are many times that you don’t know what to do when you get bored. Boredom is an emotional state that can affect a person’s attitude. Luckily, there are many fun activities you can do to kill boredom. Exercise  Are you paying for a membership at a gym? This is the perfect moment for you to go to the gym and work out for a little bit. There you can relax your mind and get your body in a good shape. Or you can simply go jogging for an hour or so down on the street. Click here to check out some good exercises to burn calories fast下列有关实验的叙述,正确的是(    )A.将解离、漂洗、染色的根尖置于载玻片上,盖上盖玻片即可在镜下观察B.利用天竺葵探究光合作用是否产生淀粉,不必进行黑暗处理C.在叶绿体色素提取实验中,研磨绿叶时应加一些有机溶剂,如95%的乙醇等D.检测试管中的梨汁是否有葡萄糖,可加入适量斐林试剂后,摇匀并观察颜色变化
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