If you have ever been swimming in the ocean, you may have noticed that sea water is easier to float in than pool water. Here's why.
You'll need：
Two bowls Food coloring Spoon Salt Two eggs
1: Fill bowls half way with water.
2:Add 10 tablespoons of salt to one bowl, mix until it dissolves (溶解), and then add several drops of color.
3:Carefully, put an egg into each bowl of water and watch what happens.
What happens?
The egg in the plain water sinks. The egg in the salt water floats.
(If the salt water egg does not float well, mix more salt into the bowl )
The water and salt particles（粒子）in the salt water bowl are closer together it than plain water particles are. They push harder against the egg than the plain water particles do and the egg floats.
1.The purpose of: the experiment is to explain ________________.
A.why the egg floats in the salt water
B.why people float more easily in the sea
C.how we can make the egg float in water
D.how the water and salt particles act together
2.According to the text, if the egg in the salt water doesn’t float, which is the reason?
A.The water is too hot. B.The egg is not fresh.
C.The bowl is too small. D.The salt is not enough.
3.What is this passage probably taken from?
A.A science magazine B.A tour guide. C.A news report. D.A geography book
Mr. Fogarty slowly looks over the rows of boys, each holding his breath and praying(祈祷) it’s not his turn. Mr. Fogarty’s eyes pass over them and they can_________again. His eyes land on me and my heart jumps.
This is what I ___________every Tuesday during jazz practice. I’m fine during practice until it’s time for each of us to stand and play our instrument, alone, with everyone else watching. I always pray for Mr. Fogarty to _________me, but he never does. However, he calls me out in front of everyone, every time.
Mr. Fogarty mouths, “You’re_________.”
My partner smiles. He knows how much I_______this moment each week and in some way it gives him pleasure to see me sweat.
I pray that the kid before me will never stop when he finishes his solo(独奏曲). My heart beats so hard that I can hardly breathe as I stand up.
I start to breathe out the first notes( 音 符 ). I hold them as long as I can and then I look at the music, hoping to _______the safe pattern of musical notes that tell me what to do. But no, I have to trust myself.
Suddenly the notes on the page start jumping at me, each coming so fast I’m not___________which to play first. So I play them all. All my thoughts are musical notes, and they’re moving so fast that I don’t have time to_______what to play next. I just let my hands go. I’m so caught up in my solo that I don’t_______how long I’ve been playing.
Mr. Fogarty gives me a signal and, suddenly, I stop, and free my hands from the saxophone(萨克斯管) which is still warm from my________________fingers.
My band teacher is smiling at me satisfyingly.
1.A.talk B.play C.practice D.breathe
2.A.think about B.show off C.go through D.look forward to
3.A.remember B.forget C.help D.guide
4.A.alone B.last C.first D.next
5.A.expect B.hate C.fear D.enjoy
6.A.follow B.form C.practice D.show
7.A.afraid B.worried C.amazed D.sure
8.A.look up B.think about C.pick out D.find out
9.A.understand B.mind C.notice D.discover
10.A.unskilled B.strong C.helpless D.dancing
—Keeping pet dogs is a good idea. It’s wonderful to see them growing up quickly.
—________Some dogs bark at night and this stops their neighbours from getting any sleep.
A.I don’t agree with you. B.I think so, too. C.Neither do I. D.Are you kidding?
—Great changes have taken place in our hometown over the past years.
—Yeah. Things ______different when we were young.
A. have been B. are C. will be D. were
—What do you think of Jason?
—He has me with his good sense of humour.
A. impressed B. admired C. reminded D. warned
—Which of the shirts do you like better?
—I’ll take________. They are expensive and out of fashion.
A.neither B.either C.none D.both
