WITH WHAT TOPIC IS THE PASSAGE PRIMARILY CONVERNED

41. - DE DAP AN THI THU TIENG ANH THPT CHUYEN DHSP HA NOI2011
Tiếng Anh DE DAP AN THI THU TIENG ANH THPT CHUYEN DHSP HA NOI2011

41. With what topic is the passage primarily converned?

A. Communication among drivers

B. Direct observation of the ocean floor

C. Undersea vehicles

D. Technological advances in oceanography