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Words learnedNew words formed-cyconsistent_________accurate_efficiency_-yrecover_minister_assemble_________

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（）是海上货物运输合同成立的证明。

A. 提单
B. 托运单
C. 海运清单
D. 海运单

（）指加注有货物及包装状况不良或存在缺陷如水湿、油渍、污损、锈蚀等批注的提单。

根据明确受让人与否，提单背书可分为（）、指示提单和（）

MOOC，a massive open online course,aims at providing large-scale interactive participation and open accessvia the web.In addition to traditional course materials such as videos,readings,and problem sets,MOOCs provide _1_user forums that help build a community for the students,professors,and teaching assistants.MOOCs first made 2 in the fall of 2011,when Professor Sebastian Thrun from Stanford Universityopened his graduate-level artificial intelligence course up to any student _3_，and 160 000 students in more than 190 countries signed up.This new breed of online classes is _4_ up the higher education world in many ways.Since the courses can be taken by hundreds of thousands of students at the same time,the number of universities might _5_ dramatically.Professor Thrun has even envisioned a future in which there will only need to be 10 universities in the world.Perhaps the most _6_thing about MOOCs,many of which are being taught by professors at prestigious universities,is that they're _7_.This is certainly good news for cash-strapped(经济困难的）students.There is a _8_of excitement and fear surrounding MOOCs.While some say free online courses are a great way to increase the enrollment of minority students,others have said they will leave many students behind.Some critics have said that MOOCs _9_ an unrealistic one-size-fits-all model ofhigher educationand that _10_is no replacement for true dialogues between professors and theirstudents. After all,a brainis not a computer.We are not blank hard drives waiting to be filled with data.People learn from people they love and remember the things that arouse emotion.Some critics worry that online students will miss out on the social aspects of college.