题目

The truth is: our problem helps to make us what we are. Those who _______ often learn the value of mercy. Those who struggle often learn perseverance(坚持). A . work B . win C . admit D . suffer 答案：D一对表现型正常的夫妇生了一个既是红绿色盲又是Klinefelter综合征（XXY型）患者的孩子，病因是A．与母亲有关 B．与父亲有关 C．与父亲和母亲均有关 D．无法判断