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1. 选词填空。
rubbish ocean forests land rivers Earth
(1)
The green and brown parts of the Earth are
and
.
(2)
The water from
all goes into the
.
(3)
Pick up the
and keep the ground clean.
(4)
The
gets sick because some parts of it become dirty.
【考点】
名词辨析;
【答案】
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选词填空（多句）
普通
课时演练
换一批
1. We must stop cutting down ________ trees.
A.
much
B.
so much
C.
so many
单选题
普通
2. We live ________ the Earth.
A.
on
B.
in
C.
at
单选题
普通
3. The Earth
（be）very clean and beautiful in the past.
语法填空（单句）
普通