As a defense against air－pollution damage, many plants and animals ______ a substance to a

A high temperature alarm or _____ which will melt is used to guard against the explosion of compressor air pipelines.

I hope all the precautions against air pollution,

Which of the following is NOT mentioned as a way against traffic accidents？A． Bui

As soon as he opened the door, a______of cold air swept through the house.A．flowB．movement

__________[A] as [B] for [C] under [D] against

It would be difficult to have a society like ours without public goods such as defense tr