遗传变异和表观遗传变异可以共同作用维持生殖隔离，避免物种的融合。（ ）……

未分类题做一件事，往往有利也有弊，只有利而无弊的事情几乎是没有的。《淮南子．人间训》云：“众人皆知利利而病病，惟圣人知病之为利，利之为病也。”看来古人已经注意到利弊的辩证关系。 下列表述符合文意的是( )。A.现实生活中的事情都由利与弊组成B.要善于分析，争取做到利大于弊C.利与弊不是绝对的，是可以转化的D.我们应当努力争取做到有利无弊

判断题叉车载物行驶在坡度超过7°和高于一档的速度上下坡时非特殊情况不得使用制动器。 正确 错误

未分类题In the United States, the first day-nursery was opened in 1854. Nurseries were established in various areas during the (1)_____ half of the 19th century; most of (2)_____ were charitablE.Both in Europe and in the U.S. the day nursery movement received great (3)_____ during the First World War, when (4)_____ of manpower caused the industrial employment of unprecedented numbers of women.In some European countries nurseries were established (5)_____ in munitions plants, under direct government sponsorship. (6)_____ the number of nurseries in the U.S. also rose (7)_____, this rise was accomplished without government aid of any kinD.During the years following the First World War, (8)_____, Federal, State, and local governments gradually began to exercise a measure of control (9)_____ the day-nurseries, chiefly by (10)_____ them and by inspecting and regulating the conditions within the nurseries.The (11)_____ of the Second World War was quickly followed by an increase in the number of day-nurseries in almost all countries, ms women were (12)_____ called upon to replace men in the factories.On this (13)_____ the U.S. government immediately supported the nursery schools, (14)_____ $6,000,000 in July, 1942 for a nursery-school program for the children of working mothers.Many States and local communities (15)_____ this Federal aiD.By the end of the war, in August, 1945, more than 100,000 children were being cared (16)_____ in daycare centers receiving Federal (17)_____. Soon afterward, the Federal government (18)_____ cut down its expenditures for this purpose and later (19)_____ them, causing a sharp drop in the number of nursery schools in operation. However, the expectation that most employed mothers would leave their (20)_____ at the end of the war was only partly fulfilleD.A.latterB.lateC.otherD.first

未分类题As used in the third sentence of the second paragraph, the word 'utter' means ______.A.addressB.ultimateC.thoroughD.decisive

未分类题As used in the fifth sentence of the fourth paragraph, the word 'essentially' means ______.A.greatlyB.extremelyC.basicallyD.necessarily

单项选择题列表中的数据是可以修改的。( )

未分类题You're busy filling out the application form. for a position you really need; let's assume you once actually completed a couple of years of college work or even that you completed your degreE.Isn't it tempting to lie just a little, to claim on the form. that your diploma represents a Harvard degree? Or that you finished an extra couple of years back at State University? More and more people are turning to utter deception like this to land their job or to move ahead in their careers, for personnel officers, like most Americans, value degrees from famous schools. A job applicant may have a good education anyway, but he or she assumes that chances of being hired are better with a diploma from a well-known university. Registrars at most well-known colleges say they deal with deceitful claims like these at the rate of about one per week.Personnel officers do check up on degrees listed on application forms, then, if it turns out that an applicant is lying, most colleges are reluctant to accuse the applicant directly. One Ivy League school calls them 'impostors'; another refers to them as 'special cases' one well-known West Coast school, in perhaps the most delicate phrase of all, says that these claims are made by 'no such peoplE.'To avoid outright lies, some job-seekers claim that they 'attended' or 'were associated with' a college or university. After carefully checking, a personnel officer may discover that 'attending' means being dismissed after one semester. It may be that 'being associated with' a college means that the job seeker visited his younger brother for a football weekenD.One school that keeps records of false claims says that the practice dates back at least to the turn of the century—that's when they began keeping records, anyhow.If you don't want to lie or even stretch the truth, there are companies that will sell you a phony diplomA.One company, with offices in New York and on the West Coast, will put your name on a diploma from any number of nonexistent colleges. The price begins at around twenty dollars for a diploma from 'Smoot State University.' The prices increase rapidly for a degree from the 'University of PurduE.' As there is no Smoot State and the real school in Indiana is properly called Purdue University, the prices seem rather high for one sheet of paper.The main idea of this passage is that ______.A.employers are checking more closely on applicants nowB.lying about college degrees has become a widespread problemC.college degrees can now be purchased easilyD.employers are no longer interested in college degrees

未分类题According to the passage, 'special cases' refers to cases where ______.A.students attend a school only part-timeB.students never attended a school they listed on their applicationC.students purchase false degrees from commercial firmsD.students attended a famous school

未分类题2007年3月5日对N公司全部现金进行监盘后，确认实有现金数额为1 000元。N公司3月4日账面库存现金余额为2 000元，3月5日发生的现金收支全部未登记入账，其中收入金额为3 000元、支出金额为4 000元，2007年1月1日至3月4日现金收入总额为165 200元、现金支出总额为165 500元，则推断2006年12月31日库存现金余额应为( )元。A.1 300B.2 300C.700D.2 700

不定项选择身体的能量来自食物，充足的营养食物摄入，对身体健康很有益处。