There are few families in the United States that do not have either a radio or television set. Both_刷题宝

题干

    There are few families in the United States that do not have either a radio or television set. Both of them have become a necessary part of our daily life, keeping us filled with the news of the day, teaching us in many fields of interest, and making us happy with singing, dancing and acting.
    Marconl, the Italian inventor, who gave us the radio, probably didn't know how much his great invention would have done for the world in the years to come. Radio had, perhaps done as much as any other communication tool. Things of the world can be reported to people everywhere a few seconds after they happen. Travelers in or out of–the–way places, ships at sea even astronauts round the earth are able to keep in touch with each other by radio.
    Television is another important invention. It lets us see as well as hear the actor. Since its appearance, TV has done a great deal in the daily life of people everywhere. Many programs are now televised in color.
    Perhaps the most modern invention is “Telstar”, a “star” moving round the earth. It makes it possible for the people all over the world to be closer than ever before. Now a family in Chicago can watch on TV a motor–car race in Italy, a table tennis competition in Beijing or a volleyball match in Japan as these events are actually happening!

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在视觉形成的过程中，形成图像和形成视觉的部位分别是( )

同类题2

已知雨滴在空中运动时所受空气阻力f=kr²υ²，其中k为比例系数，r为雨滴半径，υ为其运动速率．t=0时，雨滴由静止开始下落，加速度用a表示．落地前雨滴已做匀速运动，速率为υ₀．下列对雨滴运动描述的图象中一定错误的是（）

同类题3

选择正确的句子序号，补全文章。

Building Trust in a Relationship Again

Trust is a learned behavior that we gain from past experiences.____（1）Trust is a risk.But you can't be successful when there's a lack of trust in a relationship that results from an action where the wrongdoer takes no responsibility to fix the mistake.21·cn·jy·com

Unfortunately，we've all been victims of betrayal.Whether we've been stolen from，lied to，misled，or cheated on，there are different levels of losing trust.Sometimes people simply can't trust anymore.____ （2）It's understandable，but if you're willing to build trust in a relationship again，we have some steps you can take to get you there.

●____（3）Having confidence in yourself will help you make better choices because you can see what the best outcome would be for your well－being.

●____（4）If you've been betrayed，you are the victim of your circumstance.But there's a difference between being a victim and living with a “victim mentality”．At some point in all of our lives，we'll have our trust tested or violated.

●You didn't lose “everything”．Once trust is lost，what is left？Instead of looking at the situation from this hopeless angle，look at everything you still have and be thankful for all of the good in your life.____（5） Instead，it's a healthy way to work through the experience to allow room for positive growth and forgiveness.

A．Learn to really trust yourself.

B．It is putting confidence in someone.

C．Stop regarding yourself as the victim.

D．Remember that you can expect the best in return.

E．They've been too badly hurt and they can't bear to let it happen again.

F．This knowledge carries over in their attitude toward their future relationships.

G．Seeing the positive side of things doesn't mean you're ignoring what happened.

同类题4

现有下列十种物质：①液态HCl ②NaHCO₃③NaCl溶液 ④CO₂⑤蔗糖晶体 ⑥Ba（OH）₂⑦红褐色的氢氧化铁胶体 ⑧NH₃⑨空气 ⑩Al₂（SO₄）₃

同类题5

一定条件下，在密闭容器中，能表示反应X（气）＋2Y（气）

2Z（气）一定达到化学平衡状态的是
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③密闭容器中的压强不再发生变化      ④单位时间内生成n molZ，同时生成2n mol Y

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