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求英语高手指点.1 句子改错Dispite much research ,there are still certain

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求英语高手指点.
1 句子改错
Dispite much research ,there are still certain elements in the life cycle of the insect that
is not fully undertood. (在学习主谓一致后的练习题,估计是主谓一致的问题,可是不知道错在哪里)
2 单选题.he is from ( )and i am from( )
A , a worker family a peasant family B, a worker family peasant family
感激不尽
答:1.第一个地方我感觉是单复数的问题,前面是There are,后面的从句是that is,前后的单复数形式不一致,根据elements是复数形式,我认为应该把that is改为that are.
2第二个选择A