题干

下图是两种气体发生反应的微观示意图,其中不同的球代表不同种原子。下列有关该反应的说法中,不正确的是( )

A:反应物为两种单质

B:分子在化学变化中可以再分

C:反应后生成了两种新的化合物

D:参加反应的两种分子的个数比为1﹕1

上一题 下一题 0.0难度 选择题 更新时间:2019-11-12 05:44:27

答案(点此获取答案解析)

C

同类题4

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

    Injuries and deaths caused by driving after drinking are preventable. Sadly, actions by the police can only catch a small number of drunk drivers on the roads. It is up to each person to make the decisions.____So we should help guide our friends and persuade them to avoid driving after drinking. Here are some tips.Start talking to the person early. With every drink, judgment becomes increasingly uncontrolled.____So as soon as your friend starts drinking, you should try to persuade him to make a plan to get home safely. Remember, after he gets drunk, he may not listen to you.Help the person realize he is drunk. Talk to him and show him that he is increasingly clumsy.____For example, ask who you can call to pick him up, or what public transport he would like to use. If he knows he is drunk, he may follow your advice.Make last efforts. If all else fails and a drunk person wants to drive home, threaten to call the police or take his keys.____When he is not concentrated, take his keys. This may make it easier to convince him to take a cab home. Remember, don't give him the keys even if he's angry.____If you once drove home after you got drunk, your friend may not listen to you. So in order to succeed in persuading your friend to avoid driving after drinking, you should behave yourself first.

A. Ask him where his keys are.

B. Set a good role model.

C. Give him an alternative way to get home.

D. But it isn't easy to make the right decisions.

E. Make him realize drinking makes him look like a fool.

F. The police will come to help you out once you call them.

G. It means the more one drinks, the less likely that he will listen to you.