[填空题]
Every geologist is familiar with the erosion cycle. No
sooner has an area of land been raised alive sea-level than it becomes subject
to the erosive forces of nature. The rain beats down on the ground and washed
(51) the finer particles, sweeping them into rivulets and then
into rivers and out to sea. The frost freezes the rain water in cracks of the
rocks and breaks (52) even the hardest of the constituents of
the earth’s crust. Blocks of rock dislodged at high levels are brought down by
the force of gravity. Alternate heating and (53) of bare rock
surfaces causes their disintegration. In the dry regions of the world the wind
is a powerful force in removing material from one area to another. All this is
natural. But nature has also provided certain defensive forces. Bare rock
surfaces are in (54) course protected by soil itself
dependent initially on the weathering of the rocks. Slowly (55)
surely, different type
[单项选择] Every profession or trade, every art and every science has its technical vocabulary, the function of which is partly to designate things or processes which have no names in ordinary English, and partly to secure greater exactness in nomenclature. Such special dialects, or jargons, are necessary in technical discussion of any kind. Being universally understood by the devotees of the particular science or art, they have the precision of a mathematical formula. Besides, they save time, for it is much more economical to name a process than to describe it. Thousands of these technical terms are very properly included in every large dictionary, yet, as a whole, they are rather on the outskirts of the English language than actually within its borders.
Different occupations, however, differ widely in the character of heir special vocabularies. In trades and handicrafts, and other vocations, like farming and fishery, that have occupied great numbers of men from remote times, the techn
A. a linguist
B. an attorney
C. a scientist
D. an essayist
