问题
单项选择题
在有丝分裂过程中，使用（）可以抑制纺锤体的形成。
A、秋水仙素
B、紫杉酚
C、羟基脲
D、细胞松弛素B
答案
参考答案：A
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在有丝分裂过程中，使用（）可以抑制纺锤体的形成。
A、秋水仙素
B、紫杉酚
C、羟基脲
D、细胞松弛素B
参考答案：A
My aunt bought me a bicycle on my ninth birthday. She told me to learn to ride by ___36___. But I really didn’t know___37___to ride a bike. What should I do? First, I watched the other people ride. Then I pushed out the bicycle from my house. I was ___38___ I’d fall down and hurt my knees. But I knew I had to get on it sooner or later. So I___39___ to get on just like what the other people did. But I fell off twenty___40___later. Just at that time, my aunt came out from the ___41___. She told me to practice again and again. So I got on the bike a second time, and fell off a second time. But I never gave up. I practiced a third time, a fourth time …. I could be on it ___43___every time I tried again then before, 5 minutes, ten minutes, half an hour… until I could. Like anything in life that you want to learn how to do or to be good at, you have to practice to ___44___it happen. Diligent practice is the key to success___45___you really want to learn to do a thing. More practice helps you to improve on the skills that you learn and ingrains （使根深蒂固）them in you until you can do it. 小题1:
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