They took _______ measures to prevent poisonous gases from escaping.
举一反三
- Ways must be found to prevent the poisonous gases ________ polluting the air. A: in B: on C: from D: at
- We must find ways to prevent the poisonous gases ________ polluting the air. A: in B: with C: from D: of
- Among the gases in the atmosphere, only the concentration of carbon dioxide may result in preventing heat around the Earth from escaping.
- In the process described by the woman, why is the coal burned A: To produce a gas containing carbon and hydrogen. B: To remove impurities from methanol. C: To heat the reactors. D: To prevent dangerous gases from formin
- 在过去几十年里，政府采取了各种措施防止灾害发生。 A: In the past few decades, the government has taken various measures to prevent disasters from happening. B: In the past few decades, the government has taken various measures to prevent disasters. C: / D: /