For 1

. AD = CDDE = DG∠ ad =∠CDG

∴△ADE≌CDG (edge theorem)

∴AE=CG

two people

According to 1, ∠AED=∠CGD.

∴∠mge+∠gem=∠dge+∠cgd+∠gem=∠dge+∠aed+∠gem=90

∴AE⊥CG

Three people

From the above, we can know that △ degree and △MGE are right triangles.

∴ mdeg * * cycle

∴∠DME= 1/2∠DOE=45

∠ Meg = 1/2 ∠ gom ≠ 45 (obviously ∠ gom ≠ 90).

∴∠DME≠∠MEG

∴DM and GE are not parallel

Four people

∫△MGE is a right triangle.

O is the midpoint.

∴OM= 1/2GE=OD

For 5

From the solution process of 3, we can know that ∠ DME = 45 is correct.

To sum up, choose 1. 2。 4。 5。 Option c

I hope I can help you!

Hope to adopt!