Look & Write 그림을 보고, 실험 절차에 어울리는 문장을 골라 기호를 쓰세요. Look at the picture and write the corresponding symbol of the sentence that matches the experiment procedure.
b c a d
a. Let the paper dry.
b. Wet the brush with lemon juice.
c. Write a secret message on paper with the brush.
d. Heat the paper with a candle. The secret message will show up slowly.
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