线性尺寸一般公差规定了（）个等级。 A.三 B.四 C.五 D.六

用方框中所给单词的适当形式填空，使短文通顺、正确、连贯 (每个单词限用一次)。

then;   do;  ;   right;   show;   different;   who;   late;   easy;  memory

Did your parents make you take music lessons? Recent research has   小题1:  that people who studied music as a child are able to remember words much better than people   小题2:  musical training. One experiment was  小题3: with sixty female American college students. A similar study was carried out with ninety boys in Hongkong of China. In both cases, students had to  小题4:words and pictures.  小题5:  they were asked how many they remembered. Scientists found that students   小题6: studied music were better at remembering words, but both groups remembered the pictures equally well. Perhaps it is   小题7:to use your imagination to associate(联想) pictures with things in your life. Also, you can make up stories for pictures.
Scientists explain the   小题8:  by saying that both musical memory and verbal (written or spoken words) memory are located in the left side of the brain. Visual memory, the kind needed for pictures, is located in   小题9:  half of the brain. Since verbal memory is very important for success at school, researchers now think that taking music lessons can give you a real academic advantage. In fact, when the students were tested a year   小题10: , the students who had stopped taking lessons still did well on verbal memory. Maybe it’s time to give music lessons a try.