① Benefits of honey (未命中，老题）
原文：According to Dr. Ron Fessenden, M.D., M.P.H. the average American consumes more than
150 pounds of refined sugar, plus an additional 62 pounds of high fructose corn syrup every year. In comparison, we consume only around 1.3 pounds of honey per year on average in the U.S. According to new research, if you can switch out your intake of refined sugar and use pure raw honey instead, the health benefits can be enormous. What is raw honey? Its a pure, unfiltered and
unpasteurized sweetener made by bees from the nectar of flowers. Most of the honey consumed today is processed honey that’s been heated and filtered since it was gathered from the hive. Unlike processed honey, raw honey does not get robbed of its incredible nutritional value and health powers. It can help with everything from low energy to sleep problems to seasonal allergies. Switching to raw honey may even help weight-loss efforts when compared to diets containing sugar or high fructose corn syrup. 11m excited to tell you more about one of my all-time favorite natural
② Tree rings (未命中，老题）
原文：Here’s how tree-ring dating, known to scientists as dendrochronology works. If you cut a tree down today, itls straightforward to count the rings inwards, starting from the trees outside (corresponding to this years growth ring), and thereby to state that the 177th ring from the outermost one towards the center was laid down in the year 2005 minus 177, or 1828. But its less straightforward to attach a date to a particular ring in an ancient Anasazi wooden beam, because at first, you don’t know in what year the beam was cut. However, the widths of tree growth rings vary from year to year, depending on the rain or drought conditions in each year.
Hence the sequence of the rings in a tree cross-section is like a message in Morse code formerly used for sending telegraph messages dot-dot-dash-dot-dash in the Morse code, wide-wide-narrow-wide-narrow in the tree ring sequence. Actually, the tree ring sequence is even more diagnostic and richer in information than the Morse code, because trees actually contain rings spanning many different widths, rather than the Morse code choice between dot and dash.
Tree-ring specialists (known as dendrochronologists) proceed by noting the sequence of wider and narrower rings in a tree cut down in a known recent year, and also noting the sequences in beams from trees cut down at various times in the past. They then match up and align the tree ring sequences with the same diagnostic wide, narrow patterns from different beams. In that way, dendrochronologists have constructed tree-ring records extending back for thousands of years in some parts of the world. Each record is valid for a geographic area whose extent depends on local weather patterns because weather and hence tree growth patterns vary with location. For
instance, the basic tree-ring chronology of the American Southwest applies (with some variation) to the area from Northern Mexico to Wyoming.