头部牛皮屑症状:十道英语选择题，四级左右难度。

21. ________that the demand for power continues to rise at the current rate, it will not be long before traditional sources become inadequate.

A)Concerning

B)Regarding

C)Ascertaining

D)Assuming

22.We find that some birds _____twice a year between hot and cold countries.

A)migrate

B)emigrate

C)transfer

D)commute

23.As visiting scholars,they _______willingly to the customs of the country they live in.

A)submit

B)commit

C)conform

D)subject

24.The professor found himself constantly_______ the question:“How could anyone do these things?"

A)poring

B)pondering

C)presiding

D)presuming

25.In those days,executives expected to spend most of their lives in the same firm and ,unless they were dismissed for_______ ,to retire at the age of 65.

A)denial

B)deduction

C)integrity

D)incompetence

26.Her jewelry_______ under the spotlights and she became the dominant figure at the ball.

A)blazed

B)dazzled

C)glared

D)glittered

27.Weeks ______before anyone was arrested in connection with the bank robbery.

A)elapsed

B)expired

C)overlapped

D)terminated

28.Often such arguments have the effect of ______rather than clarifying the issues involved.

A)blocking

B)obscuring

C)tackling

D)prejudicing

29.He raised his eyebrows and stuck his bead forward and _______it in a single nod,a gesture boys used then for O.K.when they were pleased.

A)jerked

B)twisted

C)shrugged

D)tugged

30.She had recently left a job and had helped herself to copies of the company's client data, which she intended to ______in starting her own business.

A)dwell on

B)base on

C)draw upon

D)come upon