摘要： 删去often.句首已用 whenever “无论何时 . 在句中就没必要用 often 了. 2001春季 I used to love science class-all of them-1. biology, chemistry ,geography, physics. I think I 2. liked those classes because I felt that it helped me 3. understand what the world works. For example, when4. I was a child , the rain was a mystery . In one5. class, I learned it rained. I think science classes 6. clear up mysteries. But then there is always more 7. mysteries look into. What was my least favorite class? 8. That was maths. After learn the basics of the subject, 9. nothing else seemed very practically to me . I never 10. saw how I could use it in my daily life. 答案及解析

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