What was essential to a science of refrigeration according to the passage？

In the United States, distance alone serves to isolate any group and to provide it with a ______.

For the past two years, ______.(我一下忙着准备考试).

A full-time stay-at-home mother would earn $134,121 a year if paid for all her work, an amount similar to a top U.S. ad executive, a marketing director or a judge, according to a study released Wednesday.

SECTION A COMPOSITION (35 MIN)

A donation is not a good way to aid the recovery of earthquake-hit regions. Do you agree？

Write on ANSWER SHEET TWO a composition of about 200 words:

You are to write in three parts.

In the first part, state specifically what your opinion is.

In the second part, provide one or two reasons to support your opinion.

In the last part, bring what you have written to a natural conclusion or make a summary.

You should supply an appropriate title for your composition.

Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the above instructions may result in a loss of marks.

Neither RosettaStone nor TellMeMore has announced when to______smartphone applications.