下列措施中,能使蒸发变快的是( )
A:把蔬菜装入塑料袋后放入冰箱
B:给墨水瓶加盖
C:用电热吹风将湿头发吹干
D:把新鲜的柑橘装入塑料袋
若式子(a-1)x+3 的值与x的取值无关,则a=____.
下列各式中,变形不正确的是 ( )
The findings support another study which showed that being happy ______ reduce the risk of heart disease.
叶片的叶肉属于哪种组织( )