Bad weather and air traffic are the most common causes of travel disruptions.

A、are major disruptions in financial markets that are characterized by sharp declines in asset prices and the failures of many financial and nonfinancial firms.

B、occur when adverse selection and moral hazard problems in financial markets become more significant.

C、frequently lead to sharp contractions in economic activity.

D、all of the above.

Give the company name according to the logo.

A、China Eastern Airlines

B、Air China

C、China Southern Airlines

D、Sichuan Airlines

A、imports exactly equal exports.

B、domestic firms invest in foreign countries.

C、the home economy is isolated from foreign trade or investment.

D、All of the above.