请教语法题

sunnyharuko

geographers were once concerned largely with exploring areas unknown to them and from describing distinctive features of individusal places.

为什么答案是C,我觉得B好像应该改成unknown areas.

sunnyharuko

caves are formed by the chemical or action mechanical of water on soluble rock,by volcanic activity,and earthquakes.

为什么答案不是A?

sunnyharuko

for each enzyme reaction there is an optimum temperature which maximum efficiency is achieved.

答案是D,为什么呢?

sunnyharuko

the nectar of flowers are ingested by worker bees and converted to honey in special sacs in their digestive systems.

C要怎么改?

dct

geographers were once concerned largely with exploring areas unknown to them and from describing distinctive features of individusal places.

concern...with,

areas (which are) unknown to them

dct

the nectar of flowers are ingested by worker bees and converted to honey in special sacs in their digestive systems

is ingested???

brace

【必读】语法区第一贴 －《语法区版规》提问格式说明

cd小兵

恳请楼主给出题目出处。 方便后人查询学习。

sunnyharuko

ok.谢谢提醒.

consonant

caves are formed by the chemical or action mechanical of water on soluble rock,by volcanic activity,and earthquakes.  

action mechanical-> mechanical action.  

for each enzyme reaction there is an optimum temperature which maximum efficiency is achieved.

which后面句子完整，which->in which,做连接副词

the nectar of flowers are ingested by worker bees and converted to honey in special sacs in their digestive systems

are ingested->is ingested

sunnyharuko

caves are formed by the chemical or action mechanical of water on soluble rock,by volcanic activity,and earthquakes.  

action mechanical 我也觉得这个选项有错啊.可是答案是D啊.

the nectar of flowers are ingested by worker bees and converted to honey in special sacs in their digestive systems

答案是B啊,为什么啊?