rossyx

15. Recently documented examples of neurogenesis（神经形成）, the production of new brain cells, include the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that learn new songs.
A. the brain growing in mice when placed in a stimulating environment or neurons increasing in canaries that
B. mice whose brains grow when they are placed in a stimulating environment or canaries whose neurons increase when they
C. mice's brains that grow when they are placed in a stimulating environment or canaries' neurons that increase when they
D. the brain growth in mice when placed in a stimulating environment or the increase in canaries' neurons when they
E. brain growth in mice that are placed in a stimulating environment or an increase in neurons in canaries that
A: when placed的逻辑主语是production而不是邻近的mice，句意错；动名词growing和increasing应该改成名词growth，increase
B: they指代不明，可以指代brains或mice；第二个they和第一个they不是一个对象
C: they指代brains不对；第二个they和第一个they不是一个对象
D: when placed的逻辑主语是production而不是邻近的mice，句意错；
they的指代错误，they应该指canaries，但这里是所有格，无法指代。
E: correct
16. Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendents, popular known as killer bees had migrated as far north as Southern Texas.
A. Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil,
B. In less than 35 years since releasing African honeybees outside Sao Paulo, Brazil,
C. In less than the 35 years since African honeybees had been released outside Sao Paulo, Brazil,
D. It took less than 35 years from the release of African honeybees outside Sao Paulo, Brazil, when
E. It took less than 35 years after the time that African honeybees were released outside Sao Paulo, Brazil, and then
A: Correct
D: it 没有可替代的对象，when改成that可以解决语法上的错误
E: after the time that 罗嗦，用after就可以；it没有指代对象
17. The new image of Stone Age people as systematic hunters of large animals, rather than merely scavenging for meat, have emerged from the examination of tools found in Germany, including three wooden spears that archaeologists believe to be about 400,000 years old.
A. merely scavenging for meat, have emerged from the examination of tools found in Germany, including
C. as mere meat scavengers, has emerged from examining tools found in Germany that includes
D. mere scavengers of meat, has emerged from the examination of tools found in Germany, which includes
E. mere scavengers of meat, has emerged from the examination of tools found in Germany, including
found in Germany是定语，which指向tools没有问题，该题区分C DE的关键是include的单复数，tools是复数，必须用include，E用介词including避免了这一问题。
E: correct