英语完形填空What is a comet? It is a ___1___ that goes round our s

英语完形填空
What is a comet? It is a ___1___ that goes round our sun, not in a ___2___ like the planets, but in a kind of egg ___3___ that takes it round our solar system, ___4___ in some cases perhaps even outside it, and then bake in ___5___. The nearest any comet gets to the edge of our sun during its orbits is about 145,000 kilometers. The ___6___ orbit is three years, and the longest is ___7___ to be something like a million years. There are thought to be about 120,000 comets in our solar system.
A comet has a head and one or more long ___8___. What are they ___9___? Most scientists believe they are frozen gases and dust, but ___10___ there has been another idea will be tested in future scientific research.
（ ）1、A、system B、body C、satellite D、zone
（ ）2、A、line B、triangle C、square D、circle
（ ）3、A、shape B、shadow C、shade D、space
（ ）4、A、but B、and C、or D、as
（ ）5、A、aboard B、away C、apart D、again
（ ）6、A、latest B、smallest C、shortest D、slowest
（ ）7、A、likely B、vital C、typical D、subtle
（ ）8、A、surfaces B、tails C、wings D、strings
（ ）9、A、made out B、made up C、made from D、made of
（ ）10、A、instantly B、nearly C、recently D、naturally