If you’re into reading, you will     1     (probable) have noticed that a brand new book has a rather special smell,     2     differs from that of an older book. Where does it come from? Three sources — the paper, the ink and the glue.

Books have been around for about 4,500 years. Some of     3     earliest books come from the fifth dynasty of Egypt, about 2,400 BC. They were written on papyrus (纸莎草纸)—similar to modern paper, but thicker. Around 200 AD, the Chinese first came up with paper, one of the greatest     4     (invention) in the world. It is made from wood. The wood must be processed with various chemicals     5    (add) to change its structure, to remove acid and to whiten the paper. Then comes the ink — there are many kinds. Some fade with time, while others get     6     (dark) than years ago. Finally, different glues are used to join the sheets together and attach the covers, whether hardcover     7     paperback. Therefore, you can smell different chemicals     8     (come) out of your new book.

In the past few decades, eBooks     9     (develop) dramatically. They might be convenient     10     (read), but you can’t give your copy to others as a present, and they don’t smell as nice.

A handsome man can earn a fifth     1    (much) than a plainer colleague but a beautiful woman is not paid a penny more than her average-looking colleague, new research has shown.

The study by senior economists found that    2    (be) good-looking meant male workers could earn 22 percent more than average-looking colleagues. Researchers said good looks did not give women a similar advantage.

Andrew Leigh, an economics professor who co-authored the report, said: “Beauty can be a double-edged sword for women.” “Some people still believe good looks and     3    (intelligent) are incompatible in women so a good-looking woman can’t be very     4    (product), but it doesn’t affect men’s pay.” He said that     5     he believed good-looking women may also earn more, the research did not support his theory.

The research found that handsome men in all jobs, from manual labour to highly-paid     6    (profession) careers, can earn 22 percent more than their colleagues     7    (do) the same work. Men with below-average looks face a battle in the office, with ugliness reducing a man’s earnings by 26 percent     8    (compare) to an average-looking worker.

The study, named Unpacking the Beauty Premium, was     9    (large) exercise of its kind and repeated a survey from 1984 to see if the beauty premium had changed. Leigh said the research showed people in the workplace were “lookist (以貌取人的) ” and he hoped the     10    (find) would encourage employers to remove their prejudice.