请教语法题（pptest1)

68. The Mississippi riverboat, whish evoled from simpler steamship of the early 1800's, because the dominant form of passenger transport  on the Mississippi River.

105.In the traditional sense, a molecule is smallest particle of a chemical substance capable of independent existence while retaining all of its chemical properties.(capable 没有错么？）

113。In the United States, the first roads were paves in colonial times ,first with logs, latest with cobblestones or brick, depending on the region.(latest为什么错，还有能说说last,late, later 的区别么？）

请教yet的用法。

68. 答案好像有争议

105. is smallest ==〉is the smallest

113 latest  和first 不平行

addition:

122, Because banana plants yield only one bunch of fruit, each plant  is  cut down after produce banana,(答案是最后的，但是因为刚刚在听词汇频率，说produce是可以说自然的生产的名次讲的，怎么改？）

123， Flash photography is widely used for taking pictures when the natural light is insufficient, such as outdoors at night and indoors most of time.(这个time怎么改？）

131, As sweeteners, there is very small difference between honey and surcose, although the former dose contain minimal quantities of vitamin, minerals, and amino acids.(small为什么错阿）

122  after produce==>after producing

produce 在这里需要作动词的意思，但after介词，后面要加ing

123 不确定，time前不应该必须加the啊

131 small==>little

关于密西西比的问题，我跟朋友们讨论的结果是，

应该是passenger transportation

1) 不同；差别；差异
Young people must be taught to learn the difference between good and evil.
必须教导年青人学会区分善与恶。
The differences between manual labour and mental labour are diminishing in some developed countries.
在一些发达国家体力劳动和脑力劳动的差别正在缩小。
There are many differences between living in a big city and living in the country.
生活在大城市与生活在乡村有许多不同之处。

2)差额；差；差距
I can't see much difference in them.
我看不出他们有什么大的差别。
The difference between 8 and 2 is 6.
八和二差是六。