22: GWD-29-Q30

Biologists working in Spain say that their discovery of
teeming life in a highly acidic river may not only broaden the search for life,
or for evidence of past life, on other planets but also show that a number
of forms of microscopic life can adapt to conditions that scientists have long
thought hostile to all but the hardiest bacteria.

        
1. show that a number of forms of
        microscopic life can adapt to conditions that scientists have long thought
        hostile to all but the hardiest bacteria

        
2. may show that a number of forms of
        microscopic life is capable of adapting to conditions that scientists have
        long thought hostile to all bacteria but the hardiest ones

        
3. shows a number of forms of
        microscopic life to be capable to adapt to conditions that scientists have
        long thought had been hostile to all but the hardiest bacteria

        
4. showing that a number of forms of
        microscopic life is capable of adapting to conditions that scientists have
        long thought had been hostile to all but the hardiest bacteria

        
5. showing that a number of forms of
        microscopic life can adapt to conditions that scientists have long thought
        hostile to all bacteria but the hardiest

the discovery of ....may not only broaden...(may)but also+原型V

因為共用助動詞may,所以要用原形動詞