文档介绍： is so weak,that a little wind can move it;
It is so strong,that you cut it with a knife and leave no trace(痕迹).
 What is it? water
 can make me,
You can take me,
You can watch me,
But you can never stop me...What am I? Time
more you take, the more you leave behind.
What is it? Footprint.
is a green round house. Inside the green round house is a smaller white house.
In the white house is a red house.
And living in the red house are lots of little black babies.
Do you know what it is?
Watermelon
fatherland is Arabia(阿拉伯),
Though in England they roast me brown.
I’m ground up inside a mill(磨粉机),
And tortured with scalding water,
And then they pour milk over me,
And drink me at their leisure.
What am I? Coffee.
are dogs afraid to sunbathe?
Because they don't want to be hot-dogs.
can’t be used unless broken?
Eggs
8. What weather do mice and rats fear?
When it’s raining cats and dogs
do fish live in water?
Because cats can’t swim.
is it that ing but never arrives?
Tomorrow.
is a river rich?
It has two banks
b