We can know that the scientists who designed the machines _____________.
   A:are careless in their daily life
   B:are unkind and cruel
   C:are out of their mind
   D:have great abilities
出自:河南科技大学大学英语3(专升本)

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