请教几道SC题

1 The growth of the railroads led to the abolition of local times,which   was determined by when the sun reached the observer's meridian and differing from city tociry, and to the establishment of regional times.

A determined by when the sun reached the observer's meridian and differed

B determined by when the sun reached the observer's meridian and differing

答案是B. 那么,B中differing是和谁并列?A错在哪里?

2 There has been a 30-to 40-fold increase in the incidence of malaria caused by increasing mosquito resistance against pesticides.

A increase in the incidence of malaria caused by increasing mosquito resistance against pesticides.

B  increase in the incidence of malaria because of incearsing resistance of mosquitoes to

答案是B. A错在哪里?

1 The growth led to 名词词组1 and 名词词组2，and to 名词词组3。

differing有名词词性，作动名词

2 搭配错误.resistance to 而不是resistance against

谢谢二楼,懂了