雅思阅读练习及答案：Search begins for Earth

　　6. 答案：rocky planets (第8段第2句：It is the rocky planets - that could be no bigger than about twice the size of the Earth - which will cause the most excitement.)

　　7. 答案：40 (第8段第3句：Scientists expect to find between 10 and 40 of these smaller planets.问题中短语“up to”的意思是“达到，高达”，所以应该选择最高的数字40。)

　　8. 答案：interiors (第9段第1句： Corot will also probe into stellar interiors by studying the acoustic waves that ripple across the surface of stars, a technique called "asteroseismology". 单词"probe”的词义是“探查，探索”。)

　　9. 答案：oscillations (第11段第2句：Small oscillations of the star also produce changes in the light emitted, which reveal what the star is made of and how they are structured internally.)

　　10. 答案：understanding (第11段第3句：This data will provide a major boost to our understanding of how stars form and evolve.)

　　11. 答案：orbiting (第12段第1句：Since the discovery in 1995 of the first "exoplanet" - a planet orbiting a star other than the Sun - more than 200 others have been found by ground-based observatories.)

　　12. 答案：harbour life (第13段：Until now the usual method of finding exoplanets has been to detect the "wobble" their gravity imparts on parent stars. But only giant gaseous planets bigger than Jupiter can be found this way, and they are unlikely to harbour life.)

　　13. 答案：atmospheres (第14段：In the 2010s, ESA plans to launch Darwin, a fleet of four or five interlinked space telescopes that will not only spot small rocky planets, but analyse their atmospheres for signs of biological activity.)