152. When the technique known as gene-splicing was invented in the early 1970's, it was feared that scientists might inadvertently create an "Andromeda strain," a microbe never before seen on Earth that might escape from the laboratory and it would kill vast numbers of humans who would have no natural defenses against it. - it would kill vast numbers of humans who would have no natural defenses against it
- it might kill vast numbers of humans with no natural defenses against it
- kill vast numbers of humans who would have no natural defenses against it(虚拟语气没有错)
- kill vast numbers of humans who have no natural defenses against them
- kill vast numbers of humans with no natural defenses against them
1、a microbe never before seen on Earth that might escape from the laboratory 我觉得应该是a microbe never been seen on earth 2、a microbe never before seen on Earth that might escape from the laboratory 它怎的就不会变成修饰earth呢?? 3、kill vast numbers of humans number如果接名词的话是否应该用单数,变成a vast number of human beings吧?? numbers为什么加复数呢??
请指教谢谢……………… |