句型转换。

1. The glasses are used for seeing in the dark. (对画线部分提问)

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2. Chelsea Lanmon invented the heated ice cream scoop.  (对画线部分提问)

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3. Chelsea Lanmon invented the heated ice cream scoop. (改为被动语态) 

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4. The telephone was invented in 1876. (对画线部分提问) 

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女性不孕的主要原因（）。

A. * * 因素

B.宫颈因素

C.子宫因素

D.输卵管及卵巢因素