请教PREP破解49题和in addition的用法

The automobile company announced that the average price of nect year's models would decrease four-tenth of one percent, amounting to about $72, as compared with aomparably equipped cars and truckd this year.

(A)The automobile company announced that the average price of nect year's models would decrease four-tenth of one percent, amounting to about $72, as compared with aomparably equipped cars and truckd this year.

(B)The automobile company annouced that the averagge price of next year's cars and trucks would decrease four-tenths of one percent, or about $72, from that of comparably equipped models this year.

正确答案是B

我就困惑于A,B选项，请NN们指点

还有，我不是很清楚in addition的用法，麻烦NN们讲下，谢谢～

哪有in addition?

A选项 amounting错误地成为了annouced伴随动作

in addition to A, B v C 中，B和A要相等吗？（B v C是主谓宾,A是名词。就像likeA, B v C中，B和A要相等)

A的错误在于容易让人觉得price经过降价以后 是72刀...

所以要用or

In addition to her work on the Miocene hominid fossil record, Mary Leakey contributed to

archaeology with her discovery of the earliest direct evidence of hominid activity and painstakingly

documenting East African cave paintings.

(A) Leakey contributed to archaeology with her discovery of the earliest direct evidence of hominid

activity and painstakingly documenting

(B) Leakey contributed to archaeology by her discovery of the earliest direct evidence of hominid

activity and by painstakingly documenting

(C) Leakey was a contributor to archaeology with her discovery of the earliest direct evidence of

hominid activity and with her painstaking documentation of

(D) Leakey's contributions to archaeology include her discovery of the earliest direct evidence of

hominid activity and her painstaking documentation of

(E) Leakey's contributions to archaeology include her discovering the earliest direct evidence of

hominid activity and painstaking documentation of

说实话对in addition to的用法也不是很了解，这题选D

in addition可能和like差不多