题干
You must cut ________ the bananas before you put ________ into the blender.
A：down; it
B：up; them
C：down; them
D：up; it
答案(点此获取答案解析）
B
You must cut ________ the bananas before you put ________ into the blender.
A：down; it
B：up; them
C：down; them
D：up; it
2MgO+C，则X的化学式为