下列实验现象描述不正确的是 [ ] A．红磷在空气中燃烧，产

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问题选择题

下列实验现象描述不正确的是 [ ]

A．红磷在空气中燃烧，产生大量白烟

B．木炭在氧气中燃烧，发出白光，生成二氧化碳气体

C．细铁丝在氧气中燃烧，火星四射，生成黑色固体

D．蜡烛在空气中燃烧有明亮的火焰，稍有黑烟，放出热量

答案

答案：B

阅读理解

根据课文内容，判断下列句子的正(T)误(F)。

( ) 1. Basketball was invented in 1861.

( ) 2. Dr Naismith created the basketball game which was played indoors at first.

( ) 3. Dr Naismith divided all his classmates into two teams to play his new game.

( ) 4. Dr Naismith used the backboard to help the players put the ball into the basket.

( ) 5. Till now, there haven’t been any Chinese basketball players in NBA.

填空题

波浪前进时，水面上每个水分子都沿着直径与波高相等的圆形轨道运动。根据波浪余摆理论，水面以下任何水层上，水分子圆形轨道的直径随深度的增加而（）。