又有问题了

1.Nebraska has floods in some years,().

a.in others drought.      b.droughts are others    c. while other droughts     d. others in drought

如何分析阿

2.Scinetists believe that by (altering) the genetic compsition of plants it is possible to develop speciments that are (resisting) to (disease ) and have (increased ) food value.

答案是b。disease 是可数的也是不可数的，分别使用于什么情况？

3.The early(periods of aviation) in the United States was marked by (exhibition flights)made by(individual filers) or by(teams of performers) at country fairs.

答案是a。我感觉是b错了阿，词序反了。？？？

4Most of our ideas of (what) ancient people looked (and ) dressed come (from) the (works of ) Renaissance artists.

答案是a，难道要改成how, 那要如何翻译。

5.Maryland ,(even though)a southern state ,(remained)(loyalty)to the Union (during ) the Civil War.

答案是c

A is correct.            这一题是很少见的题形.

1.  A) is fine. It is called  the  'some... others....'  pattern.  When we use 'some' and 'others,'  we can omit a conjunction.

Here are some examples:
Some people like potatoes, other people like rice.   We do not need to use a conjunction here.

Some people like potatoes, other people, rice.
Some people like potatoes, others, rice.

2. you might have anothter question about "drought".

The full sentence is "Nebraska has floods in some years, and it has drought in others". why it is "drought", not "droughts" to logically agree with the "floods" in the first clause?

"drought" can be count or non-count; both "drought" and "droughts" would therefore be correct in this sentence.

多谢相助！！！