15.In 1865 the astronomer Maria Mitchell ,__, became appointed to the faculty of Vassar Collage.

C the first woman

D being the first woman

D为什么不可以呢?

32.Fats and fixed oils are greasy or waxy substance that in their pure state are normally tasteless,colorless,and odorless.

是否把它改为复数?

1.c : = who is the first woman

2. agree with you.