如图所示，A点发出的光通过水面射向B点，光的传播路线为AOB，如

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问题选择题

如图所示，A点发出的光通过水面射向B点，光的传播路线为AOB，如果一束激光要从B点射到A点，则激光的入射方向是（　　）

A．BC方向

B．BO方向

C．BD方向

D．以上方向均可

答案

答案：B

选择题

看图，选择适合句子的图。

( )1. The boy can put a basketball on the finger.

( )2. The men are going to the zoo.

( )3. He likes playing computer games on Sundays.

( )4. The girl with a fan is from Japan.

( )5. They are eating something with chopsticks.

问答题简答题

简述建构主义的学习理论。