Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
Re: Ozone, a special form of oxygen that screens out harmful [#permalink]
13 Apr 2013, 09:00
This post received KUDOS
This post was BOOKMARKED
49% (01:57) correct
51% (00:56) wrong based on 59 sessions
Ozone, a special form of oxygen that screens out harmful ultraviolet rays, reaches high concentrations twelve miles above Earth, where it has long appeared that it was immune from human influence; we have now realized, though, that emissions of industrial chlorofluorocarbons deplete the ozone layer.
(A) has long appeared that it was immune from (B) has long appeared to have been immune from (C) has long appeared as being immune to (D) had long appeared immune to (E) had long appeared that it was immune to
KUDOS will encourage me to post more questions
From is wrong. So A and B out
in C being is ackward and in E we have two IT - convoluted