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The Earth is a planet. It and seven other
planets go {#blank#}1{#/blank#} the Sun. We {#blank#}2{#/blank#} (call)the eight planets and
the Sun the solar system. {#blank#}3{#/blank#} first planet, next to the Sun,
is Mercury(水星). It is 58 million {#blank#}4{#/blank#} (kilometer)from the Sun.
Venus(金星)is the second planet from the Sun, and {#blank#}5{#/blank#} (we)planet, the Earth, is the
third. It is 150 million kilometers from the Sun.
Jupiter(木星), Saturn(土星), Neptune(海王星)and Uranus(天王星)are all {#blank#}6{#/blank#} (big)than the Earth, {#blank#}7{#/blank#} Venus, Mars and Mercury are
smaller than the Earth.
Animals, trees and humans can only live {#blank#}8{#/blank#} the Earth-the other planets
in our solar system do not have air {#blank#}9{#/blank#} water. Do any planets in
other solar systems have {#blank#}10{#/blank#} (life)? We don't know about
it.
