关于真核生物mRNA的3′-末端描述不正确的是（） A.是多聚腺苷酸尾 B.指导蛋白

 Yesterday I was shopping for a few items(物品).With nothing to do at home, my son, who just left university, was ready to go together with me.

As I pushed the basket towards the register(收银机),I checked my items to see how many I had, thinking I might go to the Express Line(快速通道)where the sign said“Ten items or less”.

I started to go to that line and my son said,“Mon, you have twelve items!”I said,“You know, but they’re close.” He said,“Why are you in such a hurry to get home? You should go to the Regular Line because you have over ten items.”

Knowing he was right. I agreed and then pushed the basket to the next line. So I was waiting for my turn there and I was just removing my items from the basket to pay for them when a young man came up behind me in line with two items.

I just left the Express Line because I had too many and now I really wanted to get finished. Again, my son came up.“Mom, he has only two items and the Express Line is very long now. Won’t you just let him go first?”I agreed, and the young man smiled widely and thanked me several times.

It felt good to be with my son and have him remind me not to live a hurried life. Do what’s right and also be kind. I really take pride in him.

小题1: The writer ________ when she was pushing the basket towards the register.

A．lost something she liked best

B．found her favourite item

C．checked her handbag

D．counted the items she had小题2:The writer went to the Regular Line because _______.

A．she had 2 items

B．she had 12 items

C．she was in a hurry to get home

D．she wanted to wait for her son小题3:Of the following, which order is right according to the story?

①prepare to remove the items from the basket

②let the young man behind go first

③walk towards the Express Line

④return to the Regular Line

A．②①④③

B．④②③①

C．③④①②

D．①③④②小题4: If you pay for your items at the Express Line,_____.

A．you need to help others

B．you must wait for a long time

C．you can get finished more quickly

D．you should buy more than ten items小题5:What did the writer learn from her son that day?

A．Enjoy your life and be kind.

B．Don’t buy too many at a time.

C．Try to be friendly to your family.

D．Never waste time waiting in line.

WP700型微波炉 货号：WP700L17 产品机号：****** 额定电压及频率：220V 50Hz 额定输入功率：1180W 额定输出功率：700W 微波频率：2450MHz 外形尺寸：295mm×458mm×319mm

如图所示是WP700型微波炉的铭牌．请计算：

（1）此微波炉的输入电流．（结果保留两位小数）

（2）用此微波炉加热食品2min，食品内能最多增加多少？

方框中选出一个可以填入空白处的词语，并用其适当形式填(每空一词)。

Most children like watching TV. It’s very 小题1:    . By watching TV they can see and learn a lot and know many things about their country and the world. Of course, they can also 小题2:        over the radio. But they can learn better and more小题3:       on TV. Why?  Because they can hear and watch at the same time. But they can’t see 小题4:        over the radio. TV helps to open children’s小题5:         It helps to open their minds, too. They learn newer and Better ways of doing things. Many children watch TV only on Saturday or Sunday evening. But a few children watch TV every night. They go to bed very late. They can’ t have a good rest.

Stand over there ______ you will get a better view of the whole city.

A．or

B．though

C．but

D．and

一枚火箭由地面竖直向上发射，其速度－时间图像如图所示，由图可知：（）

A.0－t_b段火箭是上升的，t_b－t_c段火箭是下落的

B.t_b时刻火箭离地面最远

C.t_c时刻火箭离地面最远

D.0－t_a段火箭的加速度大于t_a－t_b段