同形配子
参考答案：
配子的形状、大小和行为相同。
Last year many well-known singers did everything _______ help the people in the tsunami-hit countries.
A．she could do
B．she could to
C．that she could do
D．that she could
当"鱼和熊掌不可兼得"的情况出现时，称为（）。
A.双趋冲突
B.双避冲突
C.趋避冲突
D.双重趋避冲突
