[单项选择]In deciding to undertake dangerous pursuits, people (usually strive) for their maximum personal ability rating, (when) they (are challenged) but can be victorious, rather than merely (surmounting the mediocre).
A. usually strive
B. when
C. are challenged
D. surmounting the mediocre

[填空题]In deciding to undertake dangerous pursuits, people (usually) strive for their maximum personal ability rating, (when) they (are challenged) but can be victorious, rather than merely (surmounting the mediocre).

• A. usually
• B. when
• C. are challenged
• D. surmounting the mediocre

[单项选择]
Happily married people have lower blood pressure (51) unhappily married people or singles, a Brigham Young University study says.
On the other hand, even having a supportive social network did not translate into a blood pressure benefit for singles or unhappily (52) people, according to the study.
"There seem to be some unique health benefits from marriage. It’s not just being married (53) benefits health—what’s really the most protective of health is having a happy (54) ," study author Julianne Holt Lunstad, a psychologist who specializes in relationships and health, said in a prepared statement.
The study included 204 married and 99 (55) adults who wore portable blood-pressure monitors for 24 hours. The (56) recorded blood pressure at random intervals and provided a total of about 72 readings.
"We wanted to capture participants’ blood pr
A. from
B. to
C. than
D. by

[单项选择]The greatest challenge in delivering food to people who need it is to
A. raise the resources and delivering food to poor people.
B. convince people to contribute more food and money.
C. help people improve their well-being over the long term.
D. devote more energy to those who are still most at risk.

[填空题]Many cultures have different ideas about why people catch colds. For example, in the United States, some people think that you can catch cold if your (1) get cold. So, mothers tell little children to wear (2) boots in the winter. In other places, including parts of the Middle East, some people believe that strong winds cause colds. So, on trains and buses, people usually don’t like to sit (3) open windows. In parts of Europe, some people think that wearing wet clothes will give you a cold. They say that after you go (4) , you should quickly put on dry clothes. Today, scientists know that colds are caused by viruses. But the old ideas are still very strong, and many people still follow them to (5) getting ill.Many cultures have different ideas about why people catch colds. For example, in the United States, some people think that you can catch cold if your (1) get cold. So, mothers tell little children to wear (2)