WITH WHAT TOPIC IS THE PASSAGE PRIMARILY CONVERNED

58. - DE THI THU DH THAN KHAO CO DAP AN
Tiếng Anh DE THI THU DH THAN KHAO CO DAP AN
58. With what topic is the passage primarily converned?A. Technological advances in oceanography. B. Direct observation of the ocean floor.C. Undersea vehicles. D. Communication among drivers.