单选题 ①Arctic sea ice comes in two varieties

单选题4个*号和2个?号一共能够组成多少种可能的密码?

单选题PQ is the diameter of the circle with center O 6,0 and the coordinates of polar P is 3, 2Quantity A: the coordinate of point QQuantity B: 9,-2

单选题 Members of the San, a hunter-gatherer society

单选题. ①Widespread climate change challenges traditional notions that preserving specific chunks of land is an adequate way to protect endangered species. ②Commitment to particular places has taken conservation a long way, but it works only when the climate is relatively stable. ③When climate change rather than degraded habitat threatens a species' survival in a particular location, moving the species to new locales might become one way of preserving it. ④Some ecologists argue that such assisted migration is simply a way to mimic the natural process of dispersal: its adherents intend to transport species from places that have become uninhabitable through places that humans have made impassable. ⑤Although it has its risks, assisted migration may be a necessary step in the evolution of conservation.18. The author of the passage implies that some endangered species are unlikely to migrate naturally to habitats better suited to their survival because ______

单选题Which of the following CANNOT be expressed as the product of exactly 3 consecutive positive integers?

单选题Quantity A: the shortest distance between the line x+y=3 and 2x+2y=4Quantity B: 1

单选题Select 3 people from 4 couples to form a group. Two people of one couple can not be selected at the same time. How many ways of selection are there?

单选题. ①Much recent work has examined the claim that women encounter increasing obstacles relative to men as they move up the organizational ladder in business. ②This proposition, which we term the increasing-disadvantage model, is a core element of the popular glass ceiling metaphor. ③Despite continued widespread public acceptance of the glass ceiling idea and some consistent findings, most research to date has failed to support the increasing-disadvantage model. ④Indeed, several studies based on private-sector firms find that women's mobility prospects improve, rather than decline, as they climb upward in corporate hierarchies. ⑤In the public sector, researchers have found either no sex differences in mobility or a larger female disadvantage in lower grades. ①Comparing cross-sectional national samples of workers, Baxter and Wright found no evidence in the United States, and only limited evidence in Sweden and Australia, that women's probability of being located in a higher versus a lower hierarchical level declined relative to men's at higher levels. ②Taken together, these findings suggest that the glass ceiling may be a myth. ③Women's scarcity in top organizational ranks may simply represent the cumulative effect of a constant-or even decreasing-disadvantage at successive hierarchical levels.5. The primary purpose of the passage is to ______

单选题3×104 is greater than 4×103 by what percent?

单选题 ①Since the 1970s

单选题n is a positive integerQuantity A: -1n-1Quantity B: 0

单选题Which of the following inequalities is equavalent to the inequality -3x+8＞5x-16?

单选题In the following equation, a, b and c each represents a single digit respectively.S=abc+cab+bca, where a, b, and c are all positive integersQuantity A: SQuantity B: 111a+b+c

单选题27. Computer programs are unusual in that they are virtually the only products that have been protected both by patent and by copyright. Patents protect the idea behind an innovation, whereas copyrights protect the expression of that idea. However, in order to win either protection, the idea must be clearly distinguished from its expression. Which of the following can be properly inferred from the statements above? ______

单选题 Between 1970 and 1980

单选题 A three-hour movie replaced three regularly

单选题 At a certain period in Earth's history

单选题3+32+33+…+3k，k为多少时，和能够被6整除?