(单选题)4: The water gives up energy and becomes cooler____________the ice receives energy and melts.
A: when
B: while
C: for
D: because
(责任编辑:admin) |
(单选题)4: The water gives up energy and becomes cooler____________the ice receives energy and melts.
A: when
B: while
C: for
D: because
(责任编辑:admin) |