（）They __ a picnic tomorrow

nted a cottage 31 a river in the heart of the country 32 the whole family was going to 33 a three-week holiday. There were four of us: me, Mum and Dad, and Mum‟s sister, Auntie June. Oh, and I mustn‟ t forget to 34 Spot, our little dog. I was 35 to go off by myself all day, 36 I promised to be careful and took Spot with me for 37.

One day I was out fishing with Spot when we heard a lot of shouting in the 38 followed by a scream and splash. I was a bit 39 so I called Spot and we both hid 40 a bush where we could see but not be 41 . After a few moments, a straw hat came drifting down the river, followed by an oar, a picnic basket and 42 oar. Then came the rowing boat itself, but it was 43 upside down ! A few seconds later my Dad and Auntie June came running 44 the river bank, both wet 45 . Spot started barking so I came out of hiding and said hello. My Dad got really angry 46 me for not trying to catch the boat as it went past. Luckily, 47 , the boat and both the oars had been caught by an overhanging tree a little further downstream, but not the hat or picnic basket. So I had to let them 48 my sandwiches. Dad and Auntie June both made me 49 not to tell Mum what had happened 50 she would be worried.

31.A.onB.byC.inD.across

32.A.whereB.thatC.whichD.when

33.A.planB.manageC.consumeD.spend

34.A.mentionB.bringC.sendD.lead

35.A.forcedB.orderedC.allowedD.encouraged

36.A.evenifB.providedC.lestD.asif

37.A.instructionB.inspectionC.protectionD.supervision

38.A.placeB.spaceC.skyD.distance

39.A.scaredB.amusedC.excitedD.disturbed

40.A.besideB.beforeC.behindD.beneath

41.A.seenB.viewedC.watchedD.observed

42.A.theotherB.eachotherC.anotherD.oneanother

43.A.rollingB.floatingC.circlingD.sinking

44.A.downB.besideC.toD.on

45.A.withinB.overC.underD.through

46.A.atB.againstC.withD.to

47.A.moreoverB.thenC.thereforeD.however

48.A.spareB.shareC.borrowD.divide

49.A.agreeB.decideC.guaranteeD.promise

50.A.exceptB.incaseC.inorderthatD.onconditionthat

A、two little other

B、other little two

C、other two little

D、two other little

—Will you go to picnic tomorrow？—Yes, I will go _______ it’s windy.

A、since

B、as though

C、if

D、even if

and many special parties. People like its light, lemony taste. They also like it because it keeps them from getting too thirsty. Do you drink it.

Fresh lemonade can be made by cutting a lemon in half and squeezing the juice into a cup. After the seeds are taken out, sugar and water are mixed in. One cup of lemon juice, One cup of sugar, and two quarts of water stirred together make good lemonade.

There are even easier ways to get lemonade. One way is to buy lemonade powder. Then add the right amount of water. Another way is to buy cans of frozen lemonade and mix it with water. The easiest way of all is to buy and open a can of lemonade that is ready to drink, just like a can of juice.

Lemonade is good for people. It has vitamin C. It keeps the body cool in summer. When served hot it can help a bad cold or a sore throat.

Lemonade is not a new drink. It has been around for a long time. Some say it came from China. Others think it probably came from England or France. More than four hundred years ago an English doctor wrote about the good that lemonade can do for people.

(1)、Lemonade is a (n) ______ drink.

A.old

B.popular

C.nourishing

D.A, B and C

(2)、In order to make good lemonade with one cup of lemon juice, we should add to it ______.

A.two spoons of sugar and two quarts of water

B.one cup of sugar and two quarts of water

C.one cup of sugar and one quart of water

D.one spoon of sugar and one quart of water

(3)、There are other easier ways to get lemonade, such as ______.

A.to buy lemonade powder and boil it with water

B.to go to department store

C.to buy cans of boiled water

D.to buy frozen lemonade and mix it with water

(4)、Lemonade is not a new drink. It __________.

A.appeared for a long time

B.was brought by Chinese people

C.has been around for several decades

D.can help people recover from diseases

(5)、We can infer from the passage that the writer__________.

A. thinks it is a good drink

B . is a lemonade manufacturer

C . tries to convince people that it is good for them

D . is a medical researcher

A.F（t），E（t）

B.F（t），б（t）

C.E（t），б（t）

D.F（t），E（t），б（t）

已知f（t)=t[u（t)－u（t－1)]，求s（t)=f（t)*f（t)，并画出s（t)的波形。

A.两个周期信号x(t)，y(t)的和x(t)+y(t)一定是周期信号

B.两个周期信号x(t)，y(t)的周期分别为2和，则其和信号x(t)+y(t)是周期信号

C.两个周期信号x(t)，y(t)的周期分别为2和，其和信号x(t)+y(t)是周期信号

D.两个周期信号x(t)，y(t)的周期分别为2和3，其和信号x(t)+y(t)是周期信号

A.mightn't

B.won't

C.needn't

D.mustn't

ned.

A) can’t have been B) mustn’t have been

C) shouldn’t have been D) wouldn’t have been

一般对相位闭合差要求是满足（)（△t为闭合差，T*为该反射层反射波视周期)

A . △t≤T*/3

B . △t≤T*/2

C . △t≤T*

D . △t≥T*