问题 多项选择题

数值修约规则是4舍6入5单双。符合数值修约规则的有()。

A、拟舍弃数字的最左一位数字小于5,则舍去,即保留的各位数字不变

B、拟舍弃数字的最左一位数字大于5;或者是5,而其后跟有并非全部为0的数字时,则进一,即保留的末位数字加1

C、拟舍弃数字的最左一位数字是5,而右边无数字或皆为0时,若所保留的末位数字为奇数(1,2,3,7,9)则进一,为偶数(2,4,6,8,0)则舍弃

答案

参考答案:A, B, C

阅读理解

Why do we like drinking water from plastic bottles? Some people think it is healthy and clean. Others drink bottled water because it’s easy — you can carry it around with you. In hot countries, like Greece, we often buy bottles of cold water in the summer.

However, making lots of plastic is not a good idea for many reasons. First of all, we need a lot of oil for plastic products. We usually use oil as a source(资源) of energy. If we reduced the number of bottles we made, we wouldn’t need so much oil. Plastic bottles also pollute the environment. If we recycled all our plastic bottles, we wouldn’t need so much space for rubbish dumps. But in Greece, we don’t recycle much of the plastic we use. In 2006, Greeks recycled only about 10% of plastic waste. The rest became rubbish on land and in rivers and sees. So next time you want to throw away a plastic bottle in the litter bin, stop and think. If you recycled it, you would help the environment. But what can you do when there isn’t a recycling bin near you? Well, there are loes of useful ways that you can use your bottles again. For example, an empty bottle makes a great piggy bank for your pocket money, and if you cut a bottle in half, you will have a plant pot. Go green! You can make a difference.

小题1:What is not mentioned about bottled water in this passage?

A.It’s healthy.

B.It’s clean.

C.It’s easy.

D.It’s expensive.小题2:Plastic products are made from         .

A.energy

B.oil

C.rubbish

D.plants小题3:        of plastic waste became rubbish in Greece in 2006.

A.10%

B.50%

C.80%

D.90%小题4: Which is the best way to deal with used plastic bottles?

A.To recycle them.

B.To make a piggy bank.

C.To make a plant pot.

D.To drop them into the river.小题5: The underlined part in this passage tells us “       ”.

A.To make a different life, you’d better go outside.

B.To look different, you’d better wear green clothes.

C.To protect the environment, you can do something.

D.To go green, you should use plastic products.

解答题