15. During the summer in Mesopotamia, A. high humidity kept people indoors
B. melting snow led to flooding
C. snow sometimes fell
D. water was scarce

Completar fill in the blanks with words from the list based on the panorama cultural video.

Does increased security engender feelings of increased safety or does it increase the fears that people have?

Before they can be published, scientific papers must be peer-reviewed. this means that: a) some other scientific experts read the papers and guarantee that they are true.b) some other scientific experts read the papers and provide quality control by eliminating many mistakes.c) an editor reads the papers, to make sure that all the semicolons are in the correct places.d) everyone in the world is given the opportunity to comment on the papers through a specially maintainedblog.e) government bureaucrats read the papers, to be sure that the papers do not insult the political positions ofthe current officeholders.