TRIK JITU MENGERJAKAN SOAL TOEFL,WRITTEN EXPRESSION DAN PEMBAHASANNYA
TRIK JITU MENGERJAKAN SOAL TOEFL(READING) DAN JAWABANNYA
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In addition to these various types of deep mining,several types of surface mining may be used when minerals lie relatively close to the surface of the Earth.One type is open pit mining.The first step is to remove the overburden,thethe layers of rock and earth lying above the ore,with giant acrapers.The ore is broken up in a series of blasting operations.Power shovels pick up the pieces and load them into trucks or,in some cases,ore trains.These carry it up ramps to ground level.Soft ores are removed by drilling screws,called augers.
Another type is called"placer" ining,sometimes heavy metals,such as gold,are found in soil deposited by screams and rivers.The soil is picked up by a power shovel and transferred to a long trough.Water is run through the soil in the trough.This carries soil particles away with with it.The metal particles are heavier than the soil and sink to the bottom where they can be recovered.
The finishing off process of mining is called mineral concentration.In this process,the desired substances are removed from the waste in various ways.One technique is to bubble air through a liquid in which ore particles are suspended.Chemicals are added that make the minerals cling to the air bubbles.The bubbles rise to the surface with the mineral particles attached,and they can be skimmed off and saved.
1.The word"them" in line 4 refers to
a.power shovels
b.layers of rock and earth
c.giant scrapers
d.pieces of ore
2.To which of the following does the word"these"in line 5 refers?
a.ramps
b.trucks or ore trains
c.augers
d.blasting operations
3.The pfrase"another type"in line 7 is a reference to another types of
a.deep mining
b.ore
c.metal
d.surface mining
4.The word"in line 9 refers to
a.a power shovel
b.gold
c.running water
d.a long trough
5.In line 11,the phrase"this process"refers to
a.surface mining
b.the depositing of soil
c.mineral concentration
d.placer mining
6.The word"they"in line 14 refers to
a.the processes
b.the air bubbles
c.the chemicals
d.the minerals
reference:
TOEFL SUCCESS(PETERSON'S)
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soal soal toefl dan pembahasannya 2