[单项选择]Although how language began is still a puzzle, why language began seems rather clear.（）
A. 虽然语言如何产生仍是一个谜，语言产生的原因则似乎相当清楚了。
B. 尽管语言的产生是一个谜，语言为什么产生却已相当清楚。
C. 尽管语言如何出现还是一个谜，但语言为什么出现似乎很清楚。
D. 虽然语言的开始依然是一个不解之谜，而语言为什么产生却已经相当清楚了。

[简答题]Perhaps the greatest puzzle of all is not why some people are left-handed, but rather why so few are. (Passage One)

[单项选择]The light is still on. Why not （　）
A. turn it on
B. turn it off
C. turn on it
D. turn off it

[单项选择]

How and why would strain and anxiety trigger some of us to pile on extra weight Stress activates the flight-or-fight response (应激反应), a physiological reaction designed to get your body moving quickly in a physical emergency. When your brain perceives a threat, it sounds the alarm to your adrenal glands (肾上腺) to pump out the stress hormone cortisol (皮质醇). The hormone then signals fat cells to quickly release energy, which your muscles can use for a surge of power to "flee" or "fight". When the danger passes, cortisol briefly stays elevated to encourage your body to replenish (补充) its fat stores, then returns to normal.
"The system works beautifully if you’re running for the last bus home after work. It gives you a burst of energy, which you recover from quickly once you take your seat," says Pamela Peeke, MD, clinical assistant professor of medicine and author of Body for Life for Women. But when you turn on the stress response for month
A. The flight-or-fight response makes our body move slowly when in a physical emergency.
B. When we feel a threat, our brain sends the alarm to our adrenal glands to pump out cortisol.
C. Our muscles can use the energy released slowly by the fat cells to flight or fight.
D. Cortisol stays elevated persistently to encourage our body to replenish its fat stores after the danger passes.

[单项选择]Why is Jane still in bed

[填空题]Although Krashen and Terrell claim that language is a ______ for communication, they consider language learning as mastery of structures by stages.

[单项选择]It is relatively easy to understand how and why nations engage in international trade.
A. 相对而言，国与国之间要发展国际贸易是比较简单的。
B. 国与国之间如何并为什么从事国际贸易是比较容易理解的。
C. 很多国家为什么并怎样加入国际贸易，这是相当容易理解的。
D. 一些国家为什么和怎样致力于国际贸易，这是相对简单的问题。

[单项选择]How and why this language has survived for more than a thousand years，while spoke by very few，is hard to explain. 　　A B C D

[简答题]Sociologists are interested in how a society began and how it grew.

[简答题]discrible a program 　　how you watch 　　why you like it 　　education program is important

[单项选择]Weeks later he had still not found a job and began to feel （）.
A. displeased
B. sorry
C. discouraged
D. displaced

[单项选择]Why is the woman still working（）
A. Because she doesn’t like to have a rest.
B. Because she wishes to be a boss someday.
C. Because her boss asks her to work late.
D. Because she has to finish her report.