求教2002 5月的2个题

1 Due to persistant inbreeding, self pollinating plants have genetically more unform than Cross-pollinated plants, which harbor more genetic variability

答案是B why?

2 Addressing themes that were unique american, the poet Wait Whitman celebrated the lives of ordinary poeple  

答案是B　why ?

1 Due to persistant inbreeding, self pollinating plants have genetically more unform than Cross-pollinated plants, which harbor more genetic variability

答案是B why?

have+ N -----are +adj

2 Addressing themes that were unique american, the poet Wait Whitman celebrated the lives of ordinary poeple  

答案是B　why ?

themes不等于american  ， unique ---unique to