《2025年真题圈九年级英语全一册冀教版河北专版》

C(期末·保定)
How to Write a Secret Message
Do you want to write a message that can only be read by a certain person? Here’s an experiment on how to write such a message.
You’ll need
△ half a lemon △ a cup △ four spoons of water
△ a cotton swab(棉签) △ white paper
△ a light bulb(电灯泡)
What to do
1.Squeeze(挤)some lemon juice into water. Mix the water and juice.
2.Put the cotton swab into the mixture(混合物)and make it wet. Use the wet cotton swab to write some words on the paper.
3.Let the paper dry. Show it to someone and ask if he or she can see the words on the paper.
4.Hold the paper close to a light bulb to heat it. Ask him or her to see again.
Let me explain it!
Lemon juice has chemicals which contain carbon(碳). The chemicals break down easily when they are heated. And the carbon makes them turn a dark colour.
(　　　)62.What don’t you need for this experiment?
A.Lemon. B.Water. C.Paper. D.Milk.
(　　　)63.中考新趋势 细节排序 What is the correct order of the experiment?
a.Dry the paper.
b.Mix lemon juice and water.
c.Use a light bulb to heat the paper.
d.Put a cotton swab into the mixture.
e.Write some words on the paper with the swab.
A.abcde. B.bdace C.bdeac D.aebcd
(　　　)64.When can you see the secret message?
A.After you dry the paper.
B.After you heat the paper.
C.When you hold the paper up.
D.When you shake the paper.
(　　　)65.What subject may the writer be good at?
A.Maths. B.Physics.
C.Chemistry. D.Geography.

答案： 62-64 DCBC