Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 23 to 27. Fill in the appropriate word in question 23
We are all too well aware that the extinction of animal and plant species is one of the biggest and most horrifying threats (23) _____________ our planet these days. Having said that, there has recently
been some good news out of Russia regarding something called regeneration - a(n) (24) _____________ solution to this ever-growing problem.
Regeneration involves (25) _____________ tissue from a plant or animal that has become extinct and ‘bringing it back to life’. In recent Russian experiments, scientists took fruit and seeds from the underground burrow of a long-dead Siberian squirrel and process to regenerate a beautiful flower called the Silene stenophylla. To date, it is the oldest plant to be produced from the innovative regeneration (26)____________
Understandably, experts are over the moon about their success as it shows once and for all that tissue can survive ice conservation for thousands of years. Those who participated in the regeneration of the flower are pleased and are now hoping to find prehistoric squirrel tissue or perhaps even (27) _____________ tissue from the great woolly mammoth, which could lead to the resurrection of those two species.
[From: STARLIGHT 8, Workbook, Express Publishing. 2010]
A. heading
B. facing
C. confronting
D. hallenging
