【答案】 ①Is it necessary to tell ②It's very important for us to ③It is wellknown that
3.react v.反应,起作用,反对
Which of the metals in the table reacts the most with oxygen and water?(教材P44)
表格中的金属哪一个与氧气和水反应最厉害?
To do this you need to react quickly.要做到这一点,你需要快速反应。
react to 对……作出反应,起反应
react on/upon对……有影响
react with与……产生化学反应
react against反对;反抗
reaction n.反应;起作用(常与介词to连用)
The public reacted strongly to the news.
公众对那条资讯反应强烈。
Iron reacts with water and air to produce rust.
铁与水和空气起化学反应而生锈。
Children tend to react against their parents by going against their wishes.
孩子们倾向于违背父母的愿望来反抗父母。
Applause reacts upon a speaker.
(听众的)鼓掌对演讲人会有影响。
What was his reaction to the news?
他对这个消息有何反应?
用适当的介词填空
①Many chemical substances react
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