高中语法问题,请详细解答1.Scientists working _B_ a problem they do not know sometimes can't even guess what the final result will be. A. out B. on C. for D. to C为什么不行?2.. As far as we know, there

高中语法问题,请详细解答1.Scientists working _B_ a problem they do not know sometimes can't even guess what the final result will be. A. out B. on C. for D. to C为什么不行?2.. As far as we know, there
高中语法问题,请详细解答
1.Scientists working _B_ a problem they do not know sometimes can't even guess what the final result will be. A. out B. on C. for D. to C为什么不行?
2.. As far as we know, there are hardly any living creatures on the planets ____C___.
A. in addition to the earth B. besides the earth
C. other than the earth D. including the earth
3 I'll drop __D_ your house and bring you some books.
A. in B. on to C. in on D. in at
4.They sell cloth __A__ here in this country.
A. by the meter B. to meters
C. by meter D. to the meter
5.There was no one about and there was no garage open to which he could __B__ for help.
A. ask B. turn
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高中语法问题,请详细解答1.Scientists working _B_ a problem they do not know sometimes can't even guess what the final result will be. A. out B. on C. for D. to C为什么不行?2.. As far as we know, there
Scientists working _B_ a problem they do not know sometimes can't even guess what the final result will be. 
 
【解析】
 
   本句的结构
时间状语：Scientists working __ a problem （独立主格结构,Scientists是用作逻辑主语的独立主格,working 是现在分词.）
主要成分：they do not know sometimes and can't even guess what the final result will be
独立主格结构Scientists working __ a problem等同于状语从句 when scientists work __ a problem所表达的意思,意思是说“科学家致力于一个难题的时候”
   选项释疑
work out得出...答案 / 解决…
work on 致力于… / 继续做…
work for 为...工作 / 为...尽力        
work to 工作到…
  2.As far as we know,there are hardly any living creatures on the planets ____C___.
 
【解析】
 
   本题的意思是“就我们所知,除了地球之外行星上几乎没有任何生物”,也就是说没有生物的行星不包括地球在内.
in addition to 和 besides 都表示“除…之外还有”、“另外加上”或“包括…在内”
other than 表示“不包括…在内”
including表示“包括…在内”       
 
  3.I'll drop __D_ your house and bring you some books.
 
【解析】
 
　　 drop in 或 drop on 都表示“顺便走访某人”,如果后面跟表示处所的名词,意思是“突然闯入某处” 
　　drop in your house 意思是“突然闯入你家”
　　on/in to your house 意思都是“朝着你家方向顺便走访”
　　drop in at 意思是“到达你家的位置时顺便走访”
 
  4.They sell cloth __A__ here in this country.
 
【解析】
 
　　“by + 度量”表示“按…计算”；“to + 度量”表示“恰好达到…的量度”
　　meter是可数名词,应该带有冠词,此处特指按照“这种”布的长度计算
 
  5.There was no one about and there was no garage open to which he could __B__ for help.
 
【解析】
 
　　ask for help  意思是“面对面用语言求助”；turn to ...for help (定语从句,to which 提前) 意思是“转向特定对象求助”.
　　本题上文提到既没有人也没有开门的修理厂,因此不可能 ask for help