下列每组单词中有一个是不同类，选出这个词（共10小题；每小题1分，满分10分）
The young woman always ______ sunglasses in the sun.
– What does your brother ______? – He is of medium build.
There ______ a dolphin show in the zoo tomorrow evening.
There is _____pollution and ____fishes in the river now than 20 years ago.
The sign（标志牌）made us safe.
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