下列心脏影像中，哪项不太重要（）
A.位置
B.大小
C.形态
D.密度
E.搏动状态
参考答案：D
—Hi, Jim! Will you come to join us for a picnic this weekend?
— ________ What shall I bring?
A．Why?
B．Why not?
C．I’d rather not.
D．What for?
稀释
