题目

完形填空。Lots of students are having all kinds of sports on the playground. Class 3 is going to have a football game   1   Class 4. We don’t know which team will   2  . Look at those people over there! Some students of Class 1 are practicing the   3   jump. One of them is the best long jumper in the school. He practices hard every day. Many people think he will   4   the school record (记录) in the sports meet next spring. Not far away from them, some girls are preparing for a race. They   5   have a 400-meter race in ten minutes. Now on the corner of the playgroun杉树是一种用材林木，为了使杉树长得又快又高，可采取的措施是（     ）。A．适时去除顶芽，保留侧芽B．适时摘除侧芽，保留顶芽C．适时摘除顶芽和侧芽D．顶芽和侧芽不做任何处理