English Practice

In 2009, Libbrecht and Arnold's experiments revealed that triangular snowflakes begin with the same process of chemical bonding and forms a hexagonal shape.

• No change

• were they to form

• if they formed

• form

A mile was good enough as Cox closed in on the shore and her goal.

• NO CHANGE

• enough. As

• enough, as

• enough,

In 1946, he left the Army and began working at a job that was a self-employed photographer.

• NO CHANGE

• for himself as

• as

• DELETE the underlined portion

Snowflakes form from tiny water droplets, following a specific process of chemical bonding as they freeze, which results in a six-sided figure.

• No change

• form, from tiny, water droplets,

• form from tiny, water, droplets

• form, from tiny water droplets

The rare "triangular" snowflake, similarly, confounded scientists for years because it apparently defied the basic laws of chemistry.

• F. No change

• G. for example,

• H. additionally,

• J. however,

By re-creating snowflake formation, a discovery has revealed to scientists Kenneth Libbrecht and Hannah Arnold the cause of this apparent variation.

• No change

• the discovery of the cause of this apparent variation has been made by scientists Kenneth Libbrecht and Hannah Arnold

• scientists Kenneth Libbrecht and Hannah Arnold have discovered the cause of this apparent variation.

• the cause of this apparent variation has been discovered by scientists Kenneth Libbrecht and Hannah Arnold

During the flake's descent from Earth's upper atmosphere, other water vapor molecules bumps into the hexagonal structure.

• F. No change

• G. has bumped

• H. bumped

• J. bump

Antarctic seals rely on body fat for warmth, so Cox gained twelve pounds, it was weight that she hoped would keep her warm in the icy water.

• NO CHANGE

• she put on weight

• she gained it so

• weight

Her initial fatigue and exhaustion turned into exhiliration as she moved through water that was clearer and bluer than any she'd swum in before.

• NO CHANGE

• exhaustion

• exhaustion that left her feeling fatigued

• exhausting fatigue

Cox knew, however, that the longer she stayed in the water, the longer it would bring her body temperature--which fell to 95.5 degrees Fahrenheit by the end of the swim--back to normal.

• NO CHANGE

• back to a normal body temperature.

• in other words, back to normal.

• which was normal.