The researchers ________ the medicine to many tests to make sure that it does no harm to humabody.( )
· took
· provided
· subjected
· supplied
出自:佳木斯大学语言治疗学

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块