Section BDirections: In this section, you will hear 3 short passages. At the end of each p
Section B
Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D.
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A.Microwaves are strange electric waves.
B.Microwaves travel in straight lines and do not follow the curve of the earth's surface.
C.There are not any wires to send microwaves.
D.We must amplify microwaves in relay stations.