IN WHICH OF THE FOLLOWING ACTIVITIES WAS HERRICK INVOLVED DURING...

1386)In which of the following activities was Herrick involved during the last years of hislife?A. University teaching B. Government workC. Translating D. LecturingWhen man first learnt how to make fire, he began to use fuel for the first time. The fuelhe used was probably wood. As time passed, man eventually discovered that substances suchas coal and oil (41)_______Coal (42)_______ very widely as a source of energy until the last century. With thecoming of the industrial revolution, it was soon realized that production (43)_______ if coalwas used instead of wood. Nowadays, many of the huge factories and electricity generatingstations (44)_______ to function if there was no coal there.In the last twenty or thirty years, however, the use of coal (45)_______ As a result, therehave been changes in the coal industry. It (46)_______ that more people (47)_______ coal ifoil and gas were not available.There is more than enough coal in the world for man's needs for the next two hundredyears if your use of coal (48)_______ Unfortunately, however, about half of the world's coal(49)_______ Mining much of it (50)_______ very expensive even if it was to use newequipment.