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问题 单项选择题

一对表现正常的夫妇生了“龙凤双胞胎”，其中男孩色盲，女孩没有色盲，则此夫妇的基因型为（）

A.XbY、XBXB

B.XBY、XBXb

C.XBY、XBXB

D.XbY、XBXb

答案

参考答案：B

听力题

根据短文内容及首字母提示，填写所缺单词，使短文意思完整，每空只填一词。

Millions of American children attend summer camp. Traditional American summer camps offer young people a c_______小题1: to play many sports. These camps may be in the mountains. Or they may be in the woods, or at a lake. O_______小题2:  camps teach activities like painting or music. Or t________小题3:teach computer programming or foreign languages. Children at all kinds of camps m_________小题4: new friends. They learn new skills and develop independence (独立).

Some children go to camp d_______小题5: the day and return home at night. These places are c______小题6: day camps. Children as y_________小题7: as four years old attend day camps. Others stay at camp all day and all night. Most children w_________小题8: attend overnight camp are between the ages of about six and sixteen.

Children s________小题9: at an overnight camp for between one and eight weeks. P________小题10: can pay less than one-hundred dollars a week for an overnight camp. Or they can pay more than seven-hundred dollars a week.
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问答题

为什么要强调中央银行的独立性
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