单词辨音 在A、B、C、D四个选项中，选出划线部分读音与其余三个不同的选项， 并将该选项填入答题卷上相应的空格内。（本大题共5分，每小题0.5分）
—Which is________，the sun，the moon or the earth？ —Of course the sun． A．smaller B．the smallest C．the biggest
—What’s the________of these vegetables？ —It’s about 3 kilos．
The apples on this tree are bigger than________on that tree．
This book is________for students to read．
He thinks his hometown is________of all．
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