单项选择题

做“模拟月球的公转，观察‘月相’的变化”实验，下列实验操作错误的是（）

A、拉上窗帘，关上顶灯，打开台灯并放在教室中央
B、手臂伸直，双手托住一只排球，球的位置比头稍高
C、在教室走动，让球一直保持在身体的前方
D、观察球面受光的情形

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单项选择题

Which of the following statements is true correct? ( )

A．The weighing form and the precipitation form should be the same
B．The weighing form and the precipitation form must be different
C．The weighing form and the precipitation form can be different
D．Neither the weighing form nor the precipitate form can contain water molecules

多音节是中国语言文化的特性

答案：错误