31.
A star will compress itself into a white
dwarf, a neutron star, or a black hole after it passes through a red giant
stage, depending on mass.
(A) A star will compress itself
into a white dwarf, a neutron star, or a black hole after it passes through a
red giant stage, depending on mass.
(B) After passing through a red
giant stage, depending on its mass, a star will compress itself into a white
dwarf, a neutron star, or a black hole.
(C) After passing through a red
giant stage, a star’s mass will determine if it compresses itself into a white
dwarf, a neutron star, or a black hole.
(D) Mass determines whether a star,
after passing through the red giant stage, will compress itself into a white
dwarf, a neutron star, or a black hole.（D）
(E) The mass of a star, after passing
through the red giant stage, will determine whether it compresses itself into a
white dwarf, a neutron star, or a black hole.
为什么B不对呢？答案是D. | 
