It sounds _______ to use“Could you . . . ”than “Can you. . . ”.
A:polite
B:politely
C:more polite
D:more politely
如图是一个组合图形,请用两种方法计算出这个图形的面积(单位:米)
“You can't have them both. You can choose ________ the kite ________ the toy car,” said Mother.
下列有关细胞的生命历程,不正确的是( )