磷酸铁锂电池单体标称电压为（）V。
A.3.2
B.3.7
C.1.5
D.2
参考答案：A
I don't think she ____what happens to her children.
A．cares to
B．cares about
C．cares for
D．takes care of
资者参与认购开放式基金，分（）个步骤。
A.1
B.2
C.3
D.4
