Stop ______ a noise in the library .The students are reading books .
A:make
B:to make
C:makes
D:making
人在睡眠时,也能拍打蚊子或瘙痒,这说明( )
在“探究杠杆平衡条件”实验中,利用在杠杆两端挂钩码的方法做实验,实验装置如图所示.