题目内容
（请给出正确答案）
[主观题]
a.In addition, no one knows whether the core is solid or not, since it cannot be direc
tly observed.
b.But since the Sun has no solid surface, it is hard to tell where the atmosphere ends and the main body of the Sun begins.
c.Starting at the outside and going down into the Sun, the zones are the corona, chromosphere, photosphere, convection zone, and finally the core.
d.Solar astronomers know that the Sun is divided into five layers or zones.
e.The first three zones are regarded as the Sun’s atmosphere.
The following sentences are from a paragraph, but they are in the wrong order.Choose the correct order from A, B, C, and D.______
A、c-d-e-b-a
B、d-b-a-c-e
C、c-e-d-b-a
D、d-c-e-b-a
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