小明对所学的光学知识进行了如下归纳，你认为正确的是（ ）
A．在河边看到水中的鱼是光的反射形成的像
B．阳光下人的影子是光沿直线传播形成的
C．凸透镜对光有发散作用
D．近视眼可以用凸透镜来矫正
在河边看到水中的鱼其实看到的是鱼的虚像，是由于光的折射形成的．所以A说法错误．
阳光下人的影子是光沿直线传播，人挡住了阳光形成的．所以B说法正确．
凸透镜对光有会聚作用，所以C说法错误．
近视眼是由于晶状体的曲度过大，折光能力太强而引起的，需要佩戴凹透镜进行矫正．所以D说法错误．
故选B．
| 从下面所给出的词汇中选出恰当的词汇,用正确的形式填空,其中有2个多余的词汇. | |
2. The report ______the importance of improving safety standards. 3. He _________his daughter to change her mind. 4. Parents worry about the _______________of music on their adolescent's behavior. 5. An earthquake left the whole town in ___________. 6. What _________him most was their speed. 7. Smoking __________in the building. 8. Success and wealth _________ his character. 9. An important _____________ of Van Gogh's paintings is their bright colors. 10. Lions and house cats evolved (进化)from a common ____________. |