次の英文の空欄(   1   )～(   7   )に入る最も適切な語句をそれぞれA～Dから1つ選び、記号で答えなさい。

People (   1   ) began eating grains about 75,000 years ago in western Asia. These grains, including ^*einkorn and ^*emmer, were ancestors of today's wheat. Einkorna and emmer grew wild near the banks of rivers. People harvested the grasses that grew naturally near their communities.

People began cultivating, or growing, grain more recently. In 2009, scientists announced that they had discovered the world's oldest (   2   ) grain ^*silos at Dhra in what is now the nation of ^*Jordan. The silos, which date back 11,000 years, (   3   ) remnants of barley and an early type of wheat.

Ancient people ate grains in (   4   ) the same way we do today. Wheat grains were made into flour and used in breads. Rice was steamed and eaten hot or cold. Oats were mashed with water or milk to make oatmeal. Beer, (   5   ) of the oldest manufactured beverages in the world, is made from grain such as barley. Ancient beers had a very low alcohol content, but were good sources of carbohydrates.

In some ancient civilizations, grain products served as (   6   ) or forms of currency. Many of the workers who built Egypt's pyramids at Giza, for instance, were often paid in bread and beer.

Today, grain silos are a familiar sight to many people in the developed world. Harvesting is done almost entirely with onermous, expensive machinery. The most Important piece of agricultural machinery for grain crops is the combine harvester This remarkable machine does three jobs: it cuts the grain, ^*threshes the grain, and ^*winnows the grain combine harvesters help farmers expand the amount of grains they can harvest by (   7   ) one.

(From "Grain" National Geographic. June30, 2012＜http://educationnationalgeographic.com/education/encyclopedia/grain＞)

注)
• einkorn:ヒトツブコムギ
• emmer:エンマーコムギ
• Silo:サイロ(穀物・牧草を貯蔵するための塔状建築物)
• Jordan:ヨルダン
• thresh:～を脱穀する
• winnow:穀物をもみがらからあおぎ分ける

• (   1   )
  • A. at first
  • B. first
  • C. first time
  • D. firstly
• (   2   )
  • A. being known
  • B. knowing
  • C. known
  • D. to know
• (   3   )
  • A. conserving
  • B.contained
  • C. contended
  • D. including
• (   4   )
  • A. many
  • B. more
  • C. most
  • D. much
• (   5   )
  • A. being
  • B. each
  • C. one
  • D. only
• (   6   )
  • A. goods
  • B. nutrients
  • C. staples
  • D. wages
• (   7   )
  • A. combined three activities and
  • B. combined three activities with
  • C. combining three activities into
  • D. combining three activities with