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YDT • İngilizce 3. ADIM • 1. DENEME

61. Lord Howe Island is a small island off Australia’s east 62. We can investigate the arrangement of atoms in a
coast, and in 1887, scientists from the Australian snowflake crystal using crystallography. Though
Museum went on a groundbreaking mission there. they all start pretty much the same, once they begin
---- That wood-eating insect native to Lord Howe crystallising, no two snowflakes are alike. Indeed,
Island, Panesthia lata, was later identified as this the number of conceivable shapes is mind-boggling.
species. P. lata was found to be abundant, important A snowflake begins as a dust grain drifting in the air.
in nutrient recycling, and likely a food source for Water vapour in the air adheres to the dust particle,
the many birds that inhabited the island. But alas, forming a droplet that freezes instantly. ---- Because
a shipwreck in 1918 brought rats to the island. ice grows fastest near the edges, a hollow emerges
Extensive searches over decades failed to locate in each prism face. Six branches arise as a result
th
P. lata, and by the late 20 century, its extinction of faster growth on the corners. The lines in each
owing to rat predation was widely accepted. chapter are caused by surface ridges and grooves.

A) They found numerous exciting things, including A) Suddenly, the crystal is hit by a blast of warmer
a large Blatta, a type of cockroach, underneath a air, followed by a burst of cooler air, and more side
rotting log. branches grow.
B) Their first discovery was that the island is home to B) The X-rays go through a snowflake, hit every atom
many species found nowhere else on Earth. inside it, and then go in all different directions.
C) They set out to photograph the animal life of Lord C) Crystal faces appear on the frozen droplet, followed
Howe, the first comprehensive wildlife survey ever by the formation of a prism with six faces and a top
done in Australia. and bottom.
D) They wanted to see if the extraordinary insects they D) When the crystal comes into contact with even
had been studying could be found elsewhere. hotter air, its development slows, and its tips
E) Their goal was to get samples of cockroaches expand.
to document the characteristics of the region’s E) If there is a little bump on the surface of a snowflake,
indigenous species. the vapour will condense there rather than move
any further.

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