Mr Green is an Englishman. He teaches English well His English classes are very interesting. He likes us and we like him, too.
    Mr Green has two children----Mike and Nancy. Mike is eight and his sister Nancy is five. Mike goes to school but Nancy doesn’t. Mr Green likes to wear a T-shirt and a pair of jeans. Football is his favorite sport. After school we often have a basketball match. Sometimes Mr Green watches and joins us. He plays basketball just for us.

叶片表皮的保卫细胞中含有叶绿素，所以保卫细胞可以进行光合作用。（判断对错）

一束光线与水平面成30°角斜射到水面上，同时发生了反射和折射，请在图中画出反射光线和折射光线的大致方向，标出反射角的度数．

清洁显微镜镜头时，除去污物的正确方法是（　　）