Heap is not necessarily a complete binary tree

People tend to buy more things than ______.

A．it is necessary

B．being necessary

C．is necessary

D．to be necessary

A．Stop the flow of blood if the person is bleeding.

B．Do an operation whenever necessary.

C．Do artificial respiration if the person has stopped breathing.

D．Do the best you can until a doctor arrives.

When pioneering products are promoted, the writer notes that

A.A a heavy financial investment is require

B.B a wide variety of advertising methods must be use

C.C a clear message is likely to be communicate

D.D a long campaign is usually necessar

Which of the following statements is NOT true according to the author？

A．It is not necessary for teachers to have certification.

B．We can learn from everybody, even the little children.

C．Teaching is to force information into a supposedly empty head.

D．Teaching is to share our skills and knowledge with others.

A leader can hardly maintain his/her position unless he/she ______.

A．fulfils, all necessary quality requirements

B．helps people to prevent defeats and sorrows

C．fails Co attract people with common concerns

D．lacks appealing and strength of character

A.heap

B.stuffed

C.pile

D.stacked