说说下列几种情形中各利用了什么光．

（1）用电视遥控器可以开关电视或转换频道是利用 ____．

（2）用验钞机检验钞票的真伪是利用 ____

下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
D
Dear Editors,
    On my way to work every morning I drive by a farm where I can see some horses off in the distance in the woods. They are there every single morning no matter how cold or rainy or windy it is. There is a shed(牲口棚）on the farm, but it doesn't look to me that the horses are ever taken into the shed. Is this right? I don't think horses should be treated like this.
                                                                                                                                                                            Sam
Dear Sam,
    Thanks for taking an interest in these horses. Problems about the care of horses are different from cats and dogs. Think of wild horses that spend their whole lives outdoors finding whatever food and shelter（遮蔽物）they can on their own. The point is that horses don't require as much shelter as a lot of other farm animals. However, that doesn't mean that they don't need some shelter.
    It is hard to tell from your letter whether the situation for these horses is unacceptable. Above all, do you know the people who own the horses well enough to just talk to them as a neighbor and express your concern (关注)? Maybe they will tell you that the horses do go in the shed at night.
    If direct contact (联系）is not a choice and you can see that the horses' situation is poor, then call 911, report the situation and ask law enforcement officers (执法官员) to look into it.
    If you just can't see enough to prove such a report, call the Oswego Court Humane Society on 207-1070 for help from the Large Animal Assistance Project (LAAP). A volunteer from the project will help solve the problem.
    Speaking of volunteer assistance, since you appear to be a horse lover, why not talk to the LAAP about volunteer opportunities for you? It's big job, but totally rewarding, and the project always needs knowledgeable horse people to help.

相同质量的NO₂和N₂O₄中，其氧原子个数

Life is like the weather．Sometimes it rains but most of the time we have____ (sun)days.

People not only in China but also from many other____ (country)are influenced by Confucius(孔子).

Job said try to do things best try to do things____ (different).

-Many teens spend much time in front of____ (they)smart phones ,computers and TVs -They should cut down screen time.

-Hey,you have so many clocks in your bedroom!Are you crazy or what? -No.I am a heavy____ (sleep).I just want to make sure I can wake up on time.

综合性学习。

《放下你的鞭子》一文通过记叙卖艺为生的父女俩的悲惨命运，控诉了日本帝国主义的侵略行径。学习课文后，你所在的班级打算开展“不忘历史·爱我中华”主题班会，请你参加以下活动。