It is common to insert a consonant between two vowels or a vowel between two similar

A(71) is a data type whose major attributes are determined by the rules governing the insertion and deletion of its elements. The only element that can be deleted or removed is the one that was inserted most(72). Such a structure is said to have a last-in/first-out (LIFO) behavior, or protocol.

A．stack

B．queues

C．pointer

D．record

_________

[A] normal [B] common [C] mean [D] total

Worry is one of the _______(common) forms of emotional distress in our culture.

Organic food is common in mountainous regions.()

It is now very common for people to ________ online their thanks to the volunteers.

A.post

B.take

C.put

D.set

A.普通的

B.共产主义

C.社区

D.共产主义者

A.a

B.an

C./

D.the