河里游动的虾,树上鸣唱的知了,都属于节肢动物的理由是 [ ]
A.能迅速避开敌害
B.体表有外骨骼,足和触角分节
C.都用气管进行呼吸
D.都有三对足,两对翅
答案:B
无论是保安人员,还是普通公众,在经历危机之后总会在心理上留下创伤,需要进行必要的心理干预
-The new windows need washing.
-Well, let's wash them together,_____? [ ]
A. shall we
B. will you
C. should we
D. would you