单选题《复合题被拆开情况》 Remote work is about more than just working from home—it means working differently. Organizations should reconsider the appropriateness of their performance evaluation procedures in light o
单选题. Questions 3 and 4 are based on the news report you have just heard.3.
单选题《复合题被拆开情况》 According to recent United States Department of AgricultureUSDA projections, the country will see a sharp drop in meat consumption this year. Americans are expected to eat 12 percent less m
单选题. Psychologists take opposing views of how external rewards, from warm praise to cold cash, affect motivation and creativity. Behaviorists, who study the relation between actions and rewards, argue that rewards can improve performance at work and school. Some other researchers who study various aspects of mental life, maintain those rewards often destroy creativity by encouraging dependence on approval and gifts from others. The latter view has gained many supporters, especially among educators. But the careful use of small monetary rewards sparks in grade-school children suggesting that properly presented inducements indeed aid inventiveness, according to a study in the June Journal Personality and Social Psychology. "If they know they're working for a reward and can focus on a relatively challenging task, they show the most creativity," says Robert Esenberger of the University of Delaware in Newark. "But it's easy to kill creativity by giving rewards for poor performance or creating too much anticipation for rewards." A teacher who continually draws attention to rewards or who hands out high grades for ordinary achievement ends up with uninspired students, Esenberger holds. As an example of the latter point, he notes growing efforts at major universities to tighten grading standards and restore falling grades. In earlier grades, the use of so-called token economics, in which students handle challenging problems and receive performance-based points toward valued rewards, shows promise in raising effort and creativity, the Delaware psychologist claims.21. Psychologists are divided with regard to their attitudes toward ______.
单选题5.
单选题. We all know that DNA has the ability to identify individuals but, because it is inherited, there are also regions of the DNA strand which can relate an individual to his or her family (immediate and extended), tribal group and even an entire population. Molecular Genealogy (宗谱学) can use this unique identification provided by the genetic markers to link people together into family trees. Pedigrees (家谱) based on such genetic markers can mean a breakthrough for family trees where information is incomplete or missing due to adoption, illegitimacy or lack of records. There are many communities and populations which have lost precious records due to tragic events such as the fire in the Irish courts during Civil War in 1921 or American slaves for whom many records were never kept in the first place. The main objective of the Molecular Genealogy Research Group is to build a database containing over 100,000 DNA samples from individuals all over the world. These individuals will have provided a pedigree chart of at least four generations and a small blood sample. Once the database has enough samples to represent the world genetic make-up, it will eventually help in solving many issues regarding genealogies that could not be done by relying only on traditional written records. Theoretically, any individual will someday be able to trace his or her family origins through this database. In the meantime, as the database is being created, molecular genealogy can already verify possible or suspected relationships between individuals. "For example, if two men sharing the same last name believe that they are related, but no written record proves this relationship, we can verify this possibility by collecting a sample of DNA from both and looking for common markers (in this case we can look primarily at the Y chromosome (染色体)," explains Ugo A. Perego, a member of the BYU Molecular Genealogy research team.1. People in a large area may possess the same DNA thread because ______.
单选题. Questions 3 and 4 will be based on the following news item.3.
单选题. Questions 8 to 11 are based on the conversation you have just heard.1.
单选题[此试题无题干]
单选题. Questions 16 to 19 are based on the passage you have just heard.1.
单选题Universal Health Care，Worldwide，Is Within ReachA By many measures the world has never been in better health.Since 2000 the number of children who die before they are five has fallen by almost half，t0
单选题《复合题被拆开情况》 U. S. import prices recorded the biggest drop in five months in November as food and fuel costs tumbled 下跌, keeping inflation pressures subdued against the backdrop of a weak economy. The L
单选题 Now let us look at how we read
单选题. Questions 3 and 4 are based on the news report you have just heard.3.
单选题Universal Health Care，Worldwide，Is Within ReachA By many measures the world has never been in better health.Since 2000 the number of children who die before they are five has fallen by almost half，t0