請教黃金閱讀兩篇的問題 - 英檢

我又再度上來問問題了，如果麻煩真的很抱歉啊…=口=
麻煩各位的解答了，謝謝> <

Topic: ARCHITECTURE

Paragraph 4：Even development in architecture has been the result of major
technological changes. Materials and methods of construction are integral
parts of the design of architecture structures. In earlier times it was
necessary to design structural systems suitable for the materials that were
available, such as wood, stone, brick. Today technology has progressed to
the point where it is possible to invent new building materials to suit the
type of structure desired. Enormous changes in materials
and techniques of construction within the last few generations have made it
possible to enclose space with much greater ease and speed and with a
minimum of material. Progress in this area can be measured by the difference
in weight between buildings built now and those of comparable size built one
hundred ago.

題目:
7. In paragraph 4, what does the author imply about modern buildings?
A。They occupy much less space than buildings constructed one hundred years
ago.
B。They are not very different from the building of a few generations ago.
C。The weigh less in relation to their size than buildings constructed one
hundred years ago.
D。They take a long time to build as a result of their complex construction
methods.

答案為C，我選了D…
想請問，看到imply題，是不是要先去文中找範圍?
那這題的範圍是不是從Today technology至最後呢?
還有，為啥是選C呢??

Topic: Depletion of the Ogallala Aquifer

Paragraph 4：This unprecedented development of a finite groundwater resource
with an almost negligible natural recharge rate—that is, virtually no
natural water source to replenish the water supply—has caused water tables
in the region to fall drastically. In the 1930’s, wells encountered plentiful
water at a depth of about 15 meters; currently, they must be dug to depths
of 45 to 60 meters or more. In places, the water table is declining at a rate
of a meter a year, necessitating the periodic
deepening of wells and the use of ever-more-powerful pumps. It is estimated
that at current withdrawal rates, much of the aquifer will run dry within 40
years. The situation is most critical in Texas, where the climate is driest,
the greatest amount of water is being pumped, and the aquifer contains the
least water. It is projected that the remaining Ogallala water will, by the
year 2030, support only 35 to 40 percent of the irrigated acreage in Texas
that is supported in 1980.

題目：
9. According to paragraph 4, compared with all other states that use Ogallala
water for irrigation, Texas
A。Has the greatest amount of farmland being irrigated with Ogallala water
B。Contains the largest amount of Ogallala water underneath the soil
C。Is expected to face the worst water supply crisis as the Ogallala runs dry
D。Uses the least amount of Ogallala water for its irrigation needs

正確答案為C，我選D，想請問為什麼不是選D呢=口=
謝謝~> <

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