《剑桥雅思7》Test 1 Reading passage 2 解析

　　Question 10-13
　　题型： Sentence completion
　　Complete the sentences below.
　　Choose ONE MORE THAN TWO WORDS from the passage for each answer.

Q10:	Long before the invention of radar,........................had resulted in a sophisticated radar-like system in bats.
Answer:	natural selection
Information in the text:	Paragraph E (line 1): …but all the world now knows that bats, or rather natural selection working on bats, had perfected the system tens of millions of years earlier…

Q11:	Radar is an inaccurate term when referring to bats because........................are not used in their navigation system.
Answer:	radio waves
Information in the text:	Paragraph E (line 4): It is technically incorrect to talk about bat 'radar', since they do not use radio waves. It is sonar.

Q12:	Radar and sonar are based on similar ........................
Answer:	mathematical theories
Information in the text:	Paragraph E (line 5): But the underlying mathematical theories of radar and sonar are very similar, and…

Q13:	The word 'echolocation' was first used by someone working as a ........................
Answer:	zoologist
Information in the text:	Paragraph E (line 7): American zoologist Donald Griffin, who was largely responsible for the discovery of sonar in bats, coined the term 'echolocation' to…