题目

已知白化病由隐性基因控制，两个都带有白化病基因的正常男女结婚，预测他们的孩子患白化病的机率是（    ） A、75 %        B、50%          C、25%         D、12.5% 答案：C 阅读下面房屋信息，选择人群适合的房屋，把A～E，五个句子填在相应的题前。 A．HYTHE　Small house near the sea．2 bedrooms．＄450 a month． B．STORRING　Big house with garden．Quiet．＄750 monthly． C．CROYDON　Modern center of town．Good schools nearby．Bus and railway station, etc．＄580 a month． D．CRAWLEY　Nice modern house．9 bedrooms．Swimming pool．Lovely gardens．＄1, 500 a month． E．PULBORO　Small house in the country．2 miles from village, but near bus stop．＄480 a month． ________1．Mr．and Mr．Kern are very rich and they like swimming．They want to live in a dear house．They have a lot of friends, and they want to ask them to stay in their house． ________2．Mr．Ports wants to live in the country．He doesn’t want to walk far to the bus stop． ________3．Mr．and Mrs．Nash have three children．Mrs．Nash likes growing flowers and vegetables．They can pay ＄800 a month but they cannot pay more than that． ________4．Mr．and Mrs．Robinson have four children．They haven’t a car and they want to live in a town, and they cannot pay over ＄600 a month． ________5．Mr．and Mrs．Hill like swimming．They have no children．