英语.都好的进来!1.轮船在静水中航行每小时走x千米,水流速度为y千米/时,则轮船逆水航行50千米用_____小时.2.

英语.都好的进来!
1.轮船在静水中航行每小时走x千米,水流速度为y千米/时,则轮船逆水航行50千米用_____小时.
2.若x的平方+3x+1=0,试求x的平方+1÷x的平方=_____
3.我国政府为解决老百姓看病问题,决定下调药品价格.某种药品在 2001年涨价30%后,2003年降价70%至a元,则这种药品在2001年涨价前 的价格为___元.
英语:
1.At the foot of the hill you could hear nothing but the___of the running water.
a.shout b.noise c.voice d.sound
2.Smoking is bad for your health.You'd better___.
a.give up it b.give it up c.take out it d.take it out
3.He will give you a telephone call after he___there.
a.will reach b.reach c.get to d.reaches
二.用所给动词的适当形式填空.
1.The boy tried___(get) the kite in the tree.
2.The little girls are eating mooncakes___(fill) with fruit.
3.He finds it hard___(travel) around in the big city.
4.Mr Green is an engineer.He___(work) in China for about two years.
5.My father is very busy.He___(go) to work early every morning.
6.He went out without___(say) a word.
7.He always encourages me___(work) hard.
三.句型转换.
1.Don't be late for class next time.(改为同义句)
You_____ _____late for class next time.
2.It was raining hard,but the farmer didn't stop working in the field.(改为同义句)
_____it was raining hard,the farmer didn't stop working in the field.
3.Our teacher stopped us from talking the exam.(改为同义句)
Our teacher didn't_____us_____talk during the exam.

船逆水的时速是x-y,行驶50公里用时50/(x-y)
x^2+3x+1=0,x^2+1=3x,x+1/x=3,(x+1/x)^2=x^2+1/x^2+2=9,x^2+1/x^2=7
原价*(1+0.3)*(1-0.7)=原价*0.39=a,原价=a/(0.39)=100a/39
d
b
d
to get
filled
to travel
has been working
goes
saying
to work
mustn't be
Though
allow;to