Questões de concursos sobre "Pronome demonstrativo | Demonstrative pronoun" | Inglês - página 3

In "we will only have to make sure that these are energy efficient." (line 25-26), the pronoun 'these' refers to

Good Stuff? - A Consumption Manifesto:
The Top Ten Principles of Good Consumption
Consumption is one of life's great pleasures. Buying
things we desire, traveling to beautiful places, eating
delectable food: icing on the cake of life. But too often the
effects of our blissful consumption make for a sad story.
Giant cars exhaling dangerous exhaust, hog farms pumping
out harmful pollutants, toxic trash pestering poor
neighborhoods - none of this if there weren't something
to sell.
But there's no need to trade pleasure for guilt. With
thoughtfulness and commitment, consumption can be a force
for good. Through buying what we need, produced the way
we want, we can create the world we'd like to live in.
To that end and for the future, a Consumption Manifesto:
Principle One. Reduce, Reuse, Recycle. This brilliant triad
says it all. Reduce: Avoid buying what you don't need-
and when you do get that dishwasher/lawnmower/toilet,
spend the money up front for an efficient model. Re-use:
Buy used stuff, and wring the last drop of usefulness out of
most everything you own. Recycle: Do it, but know that
it's the last and least effective leg of the triad. (Ultimately,
recycling simply results in the manufacture of more things.)
Principle Two. Stay close to home. Work close to home
to shorten your commute; eat food grown nearby; support
local businesses; join local organizations. All of these will
improve the look, shape, smell, and feel of your community.
Principle Three. Internal combustion engines are polluting,
and their use should be minimized. Period.
Principle Four. Watch what you eat. Whenever possible,
avoid food grown with pesticides, in feedlots, or by
agribusiness. It's an easy way to use your dollars to vote
against the spread of toxins in our bodies, land, and water.
Principle Five. Private industries have very little incentive
to improve their environmental practices. Our consumption
choices must encourage and support good behavior; our
political choices must support government regulation.
Principle Six. Support thoughtful innovations in
manufacturing and production. Hint: Drilling for oil is no
longer an innovation.
Principle Seven. Prioritize. Think hardest when buying
large objects; don't drive yourself mad fretting over the small
ones. It's easy to be distracted by the paper bag puzzle,
but an energy-sucking refrigerator is much more worthy of
your attention. (Small electronics are an exception.)
Principle Eight. Vote. Political engagement enables the
spread of environmentally conscious policies. Without
public action, thoughtful individuals are swimming
upstream.
Principle Nine. Don't feel guilty. It only makes you sad.
Principle Ten. Enjoy what you have-the things that are
yours alone, and the things that belong to none of us. Both
are nice, but the latter are precious. Those things that we
cannot manufacture and should never own-water, air, birds,
trees-are the foundation of life's pleasures. Without them,
we're nothing. With us, there may be nothing left. It's our
choice.
Umbra Fisk, Grist Magazine.
Slightly adapted from: http://www.worldwatch.org/node/1470
Access on June 1, 2007.

Mark the correct statement concerning reference.

          What are the best energy sources? "Best" depends
     on many factors - how the energy is being used, where
     it is being used, what energy sources are available,
     which sources are most convenient and reliable, which
5   are easiest to use, what each costs, and the effects on
     public safety, health, and the environment. Making smart
     energy choices means understanding resources and their
     relative costs and benefits.
          Some energy sources have advantages for specific
10  uses or locations. For example, fuels from petroleum
     are well suited for transportation because they pack a
     lot of energy in a small space and are easily transported
     and stored. Small hydroelectric installations are a good
     solution for supplying power or mechanical energy close
15  to where it is used. Coal is widely used for power
     generation in many fast-developing countries - including
     China, India, and many others - because domestic
     supplies are readily available.
          Efficiency is an important factor in energy costs.
20  How efficiently can the energy be produced, delivered,
     and used? How much energy value is lost in that process,
     and how much ends up being transformed into useful
     work? Industries that produce or use energy continually
     look for ways to improve efficiency, since this is a key to
25  making their products more competitive.
          The ideal energy source - cheap, plentiful, and
     pollution-free - may prove unattainable in our lifetime,
     but that is the ultimate goal. The energy industry is
     continuing to improve its technologies and practices, to
30  produce and use energy more efficiently and cleanly.
          Energy resources are often categorized as
     renewable or nonrenewable.
          Renewable energy resources are those that can be
     replenished quickly - examples are solar power,
35  biomass, geothermal, hydroelectric, wind power, and
     fast-reaction nuclear power. They supply about seven
     percent of energy needs in the United States; the other
     93 percent comes from nonrenewables. The two largest
     categories of renewable energy now in use in the U.S.
40  are biomass - primarily wood wastes that are used by
     the forest products industry to generate electricity and
     heat - and hydroelectricity.
          Nonrenewable energy resources include coal, oil,
     natural gas, and uranium-235, which is used to fuel
45  slow-reaction nuclear power. Projections of how long a
     nonrenewable energy resource will last depend on many
     changeable factors. These include the growth rate of
     consumption, and estimates of how much of the remaining
     resources can be economically recovered. New exploration
50  and production technologies often increase the ability of
     producers to locate and recover resources. World
     reserves of fossil energy are projected to last for many
     more decades - and, in the case of coal, for centuries.

In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
In the sentence "These include the growth rate of consumption, and estimates of how much of the remaining resources can be economically recovered." (lines 47-49), "these" refers to: