Why should campers wear two pairs of socks？A．They will provide warmth.B．They will supply s

Why should you wear a self－contained breathing apparatus before entering the engine room a

It can be inferred that which of the following pairs are the two elements of the "dual inf

听力原文：（A) The man is grilling on the barbecue. （B) The old man is wearing a pair of gla

If you are overhauling machinery, you should wear （) in order to protect your headA.eysgl

The writer mentions______as a pair to indicate that people should have moderate feelings o

Which of the following about the two robbers is INCORRECT？A．Both were wearing dark sweater