Japan's current economic crisis is the worst since ______.

A．Because it is the first team that topped Mt. Everest.
B．Because all of the members of the team are blind men except Erik Weihenmeyer.
C．Because one of its members is Erik Weihenmeyer, who hopes to become the first blind man to clear
the famed Mt. Everest.
D．Because all of the members of the team are old men who are eager to climb the famed peak.

A．applied research is of the greatest significance
B．basic research is of the greatest significance
C．research in high-energy physics is of the greatest significance
D．research in high-tech fields is of the greatest significance