文章内容：Make every drop count
题目：Feeding increasing populations is possible due primarily to improved irrigation system.
原文：Food production has kept pace with soaring populations mainly because of the expansion of artificial irrigation systems that make possible the growth of 40% of the world’s food.
题目：The word ‘echo//location.href’ was first used by someone working as a ___.
原文：The American zoologist Donald Griffin, who was largely responsible for the discovery of sonar in bats, coined the term ‘echo//location.href’ to …
题目：where the expression AI was first used
原文：B The field was launched, and the term ‘artificial intelligence’ coined, at a conference in 1956…
题目：one effect of chemicals on water sources
原文：B …while the growth of algae is increasing in lakes because of the fertiliser run-off.
题目：…and also use unwanted materials as __.
原文：…and spread waste to fertilise the crop.
题目：The discovery on one pyramid of an object which resembled a _ suggests…
原文：A wooden artifact found on the step pyramid at Saqqara looks uncannily like a modern glider.
题目：…it was found that they made _ choices.
原文：…we found that their choices closely resembled those made by the sighted subjects.
题目：escapement (resembling) _
原文：…which was a lever-based device shaped like a ship’s anchor.