在一次聚会上，10个吃了水果色拉的人中，有5个很快出现了明显的不适。吃剩的色拉立刻被

I want to _________ a letter to my friend.[ ]

A. sent

B. send

C. make

以下对全冠松动原因的叙述哪项不正确（）

A.牙体固位形差

B.固位体固位力不够

C.固位体与基牙不密合

D.粘固前干燥不彻底

E.基牙牙根过短

阅读下面一段文字，完成下列各题。

①太阳在亿万年的历史长河中忠于职守地为地球提供着热量，它的能源是什么②这是一个催人探索的问题。③在相对论出现之前，人们解释说太阳内部物质燃烧而释放出能量。④相对论诞生后，则解释为原子核的裂变产生出巨大的能量。⑤这两种解释使人类面临的选择都将是痛苦的。

然而，统一论发现，太阳是宇宙中大规模的统一场场级变化，使得在某一空间区域内产生了能量辐射现象。这可以用太阳灶来打比方，聚光镜把太阳能聚焦到某一点上，于是该焦点便产生了一个能量聚焦点。太阳便是宇宙中一个巨大的能量聚焦点，这个能量聚焦点来源于宇宙统一场场能的不断变化，使太阳所在的区域内不断发生能级跃迁，从而产生巨大的能量辐射现象。其微观辐射模型，正是核外电子能级跃迁的现象。一个电子从一个能级跃迁到另一个能级，能量的吸收与释放是从整个原子系统上表现出来的。太阳能源的统一论观点使得在这一领域的宏观理论和微观理论也得到了完善的统一。

由此可见，太阳并不是悬挂在天空中的圆盘，而是宇宙运动中的一个闪光点。它闪光也不是因其自身能发光，而是宇宙运动产生的能量辐射现象，所以我们毫无必要对地球产生菲薄之念，因为地球自身就是拯救自己的真正的“太阳”。

“地球自身是拯救自己的真正的‘太阳’”，这一说法的科学依据是（）。

A．太阳的辐射现象是包括地球在内的宇宙系统运行的自然结果。

B．整个宇宙是不可分割的整体，有地球在，就一定有太阳存在。

C．地球运动是产生太阳辐射现象的必要条件，地球运动是永恒的。

D．从某种意义上说，太阳的部分在地球中延伸，地球决定了太阳。

Anyone who doubts that children are born with a healthy amount of ambition need spend only a few minutes with a baby eagerly learning to walk or a headp toddler starting to talk. No matter how many times the little ones stumble in their initial efforts, most keep on trying, determined to master their amazing new skill. It is only several years later, around the start of middle or junior high school, many psychologists and teachers agree, that a good number of kids seem to lose their natural drive to succeed and end up joining the ranks of underachievers. For the parents of such kids, whose own ambition is often inseparately tied to their children’s success, it can be a bewildering, painful experience. So it is no wonder some parents find themselves hoping that ambition can be taught like any other subject at school.

It’s not quite that simple. "Kids can be given the opportunities, but they can’t be forced. " says Jacquelynne Eccles, a psychology professor at the University of Michigan who led a study examining what motivated first-and seventh-graders in three school districts. Even so, a growing number of educators and psychologists do believe it is possible to unearth ambition in students who don’t seem to have much. They say that by instilling confidence, encouraging some risk taking, being accepting of failure and expanding the areas in which children may be successful, both parents and teachers can reignite that innate desire to achieve.

Dubbed Brainology, the unorthodox approach uses basic neuroscience to teach kids how the brain works and how it can continue to develop throughout life. The message is that everything is within the kids’ control, that their intelligence is malleable.

Some experts say our education system, with its p emphasis on testing and rigid separation of students into different levels of ability, also bears blame for the disappearance of drive in some kids. Some educators say it’s important to expose kids to a world beyond homework and tests, through volunteer work, sports, hobbies and other extracurricular activities. "The crux of the issue is that many students experience education as irrelevant to their life goals and ambitions. " says Michael Nakkula, a Harvard education professor who runs a Boston-area mentoring program called Project IF (Inventing the Future), which works to get low-income underachievers in touch with their aspirations. The key to getting kids to aim higher at school is to tell them the notion that classwork is irrelevant is not true, to show them how doing well at school can actually help them fulfill their dreams beyond it. Like any ambitious toddler, they need to understand that they have to learn to walk before they can run.

The passage is mainly about ().

A. when in one’s life ambition is most needed

B. what to do to reform the education system

C. why parents of underachievers are ambitious

D. how to help school children develop their ambition

《广温疫论》一书的作者是（）.

A.余霖

B.吴有性

C.杨栗山

D.戴天章