Q4.

Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and of many of the 100 billion other galaxies estimated to exist in the universe.

A. that a black hole lies at the center of the Milky Way and of

B. that a black hole lies at the Milky Way’s center and

C. that there is a black hole lying at the milky Way’s center and

D. of a black hole lying at the Milky Way’s center and

E. of a black hole that lies at the center of the Milky Way and of

Answer: A

1. Can the theory that... and the theory of... parallel?

2. Is estimated to a modifier of galaxies?

1.这里的平行是a black hole lies at the center of the Milky Way and of many

2.如你所说。