Do you like watching TheVoiceofChina? If you like it, you may know Zhang Lei.He ____(win) first place in TheVoiceofChinaIV.He comes from Heilongjiang.He was good at singing when he was young.He likes playing the g____He can sing many songs.People feel very ____(relax) when they hear Zhang Lei's songs.He wants to be a ____(sing) like Lao Lang in the f____ Do you like his songs?

下图是一个小麦新品种的培育过程。引起小麦这种变异的根本原因是(    )

据调查，我国青少年的近视发病率高达60％，居世界首位，并且还以每年10％的速度增长．这引起了人们的高度关注。下图是近视眼成像示意图。请分析回答：

（1）近视患者看不清____ 处的物体，可以配戴装有____ 透镜的眼镜加以矫正。
（2）如果把眼睛比喻成心灵的窗户，那么结构①____ 是窗户上那明亮的玻璃。
（3）在眼球的成像过程中，对进入眼球的光线起折射作用的结构主要是____ 。

Taking the subway is ____， but it's often very ____.