A.how to telephone |
B.about electricity |
C.about time zone(时区) |
D.about sound |
A.it was easy to phone to Los Angeles |
B.her student could hear her from 75 feet away |
C.her students had grasped her lesson |
D.sound waves were slower than electricity |
A.slower than sound waves |
B.faster than sound waves |
C.not so fast as sound waves |
D.as fast as sound waves |
A.clocks in Los Angeles showed a different time from those in New York |
B.electricity was slower than sound waves |
C.Tom was not good at physics at all |
D.Tom's answer had nothing to do with sound waves |
A.Tom's | B.Kate's |
C.Both A and B | D.Neither A nor B |