The first English dictionary was published________.

A．Biologists are conducting research where psychologists have given up.
B．Brain differences point to superiority of one sex over the other.
C．Results of scientific research fail to support popular belief.
D．The structural difference in the brain between the sexes has long been known.

A．How to render automobiles pollution- free.
B．How to make smaller and safer automobiles.
C．How to solve the problem of traffic jams.
D．How to develop an automated subway system.