In English, nouns, verbs, adjectives and ______ make up the largest part of the vocabulary, the open classes.

A．wheat prices are very low in the world
B．the demand for wheat is decreasing
C．many regions are affected by drought
D．the wheat consumption is becoming less

A．cutting down on expenditure on defense and intelligence
B．increasing expenditure on national defense
C．allocating more fund on environmental pollution
D．levying more tax on large businesses