无忧雅思出品
willing…
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25 standard research dental development population movement method early Criteria Study tooth, teeth develop, advancement migration technique prehistoric example, model, size, weight, specification, line, regulation, limit, restrict, criterion… investigation, researcher dentist promotion, improvement, high, progress, boost immigrant, shift, change strategy, skill, tool long long ago, before, previous, former, 过去式,
1890s, 1980s, ancestor, precede，archaeology
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28 further question cause Next ？ Reason then, advance, additional… suspect lead to, result in/from, attribute, abscirbe, due to,
hence, thus, therefore, accordingly, consequence
relavant, relative, friendship, fellowship
unlike, conversely, yet, nevertheless, nonetheless
2, as well as, and, on the one hand…on the other
hand, either…or…, both…and…, the former…the
latter, couple with
test, scale, calculate, figure out
shower, WC, toilet, wash, irrigate
clear, tidy, anti-bacteria, sanitation, remove, get rid
of
agriculture, peasant, farmer, farmland, field, pest,
animal, herd, cultivate, plant 29 30 31 relationship different between Relate but, however Two 32 33 34 35
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37 measure domestic water purify farming industry stage term calibrate drinking water clean, removal Farm first, second, third, finally, next, level, rank, grade, class… then be referred to as definition, technical word, vocabulary, be defined
expression
disappear, invisible, vanish, hide, underlie, escape,
secret, buried, concealed, obscure, cover
dirty, science, pollution, chemistry, DDT, poison
downtown, metropolitan
38 39 40 41 hidden chemical city positive not appear pesticide，fertilizer urban phenomenal