如图是表示生物进化大致历程的“进化树”，请据图回答
Write at least 60 words about the topic ’My Opinion on Having Lessons at Weekends’.（以“双休日上课之我见一为题写一篇不少于60个词的短文，标点符号不占格。）As a Grade Nine student, you have lessons at weekends. Do you think it is a good idea to improve your study? Why or why not? Give at least two reasons to support your opinion.作为一名九年级的学生，你双休日还要去学校上课。你觉得这是提高学习成绩的好办法吗? 请你陈述支持你观点的理由。（至少两条）（注意：短文中不得出现考生的姓名、校名及其它相关信息，否则不予评分。）
