lesson 18 Directions: in this part, you are going to listen to five transmissions or short exchanges and choose the correct answer from four choices.
A. 9 miles 6 o’clock 9000feet fast moving from left to right
B. 9 miles 6 o’clock 9000feet crossing from right to left
C. 6 miles 9 o’clock 9000feet fast moving from right to left
D. 6 miles 9 o’clock 9000feet crossing from left to right