Compared with spoken language, writing makes it possible to keep records and transmit in- formation to people who were __________ when the information was given.

A．To drive the train after it is started automatically.
B．To start the train and to drive it when necessary.
C．To take care of the passengers on the train.
D．To send commanding signals to the command spot.

A．He has a big appetite.
B．He eats only at regulate mealtimes.
C．He avoids new foods.
D．He eats only healthful foods.