1 . In early October, Travis Gienger transported an enormous pumpkin (南瓜) from his home in Minnesota to the World Championship Pumpkin Weigh-Off in California. His pumpkin set the record for the biggest one ever grown in North America. How do competitive growers get their pumpkins to grow to massive sizes?     1    

Gienger, who teaches horticulture (园艺学) at Anoka Technical College, begins growing his pumpkins in mid-April, starting with seeds that he grows indoors for the first few weeks, when Minnesota’s soil is too frosty.     2     They can absorb sunlight, nutrients from the soil, and water there. “At their peak, you’re watering them with at least 600 liters a day, ” he says.

Depending on the variety, pumpkin plants can grow up to a dozen fruits on a single vine (藤曼) . But to maximize size, growers remove all but one or two of these pumpkins in order to decrease each individual fruit’s competition for resources.     3    

But what exactly happens inside a pumpkin as it grows? Two factors drive natural growth: cell division and cell expansion. Cell division accounts for most of the growth at the beginning of a fruit’s life. This period lasts for about 20 days in pumpkin plants.     4     Pumpkin cells will expand until around 50 or 60 days after pollination (授粉).

    5     Some varieties of pumpkins have been bred specifically to maximize their size. Still, there is genetic variation even among pumpkins of the same variety. This has led to competition for the best seeds. Following each harvest, many growers auction off (拍卖掉) the seeds from their biggest pumpkins, which will then be used for the following year’s plantings.

2 . The Healing Power of Water

It has been a rough few years. Many of us are finding ourselves exhausted, burned out, struggling to build balance back into our lives.     1     Neuro scientists say that spending time near oceans, lakes, rivers and other blue spaces can provide a range of benefits including reducing anxiety, easing mental fatigue and refreshing us.

Participating in water activities such as swimming or surfing can help us enter a “flow state,” where we become fully immersed in what we’re doing.     2     When we become skilled at an activity, our brain changes, making it even easier to enter a state of flow in the future.

Bodies of water also can produce a glorious sense of awe—the emotional response to something vast that expands and challenges how we see the world.     3    

Water has special properties that may boost nature’s positive impact.     4     Its smell can provoke positive memories and associations. When we are near water, there is often less visual and auditory information to process. Our mind can rest. When we’re floating in water, our bodies can rest too, in a way we never can on land.

    5     It moves rhythmically, producing a play of light, color and sound that is spellbinding. It holds our attention, but not in an overly demanding way. Researchers call this soft fascination. It gives our brains a break from the intense, focused attention that much of daily life requires.

The Amazon rainforest is home to a great     1    (various) of plant life; however, its soil is    2       (surprising) poor in nutrients. In fact, the soil in the region cannot support agriculture for more than a few years. If a scientist is shown a report     3    (list) the nutrients of that soil, he or she will probably think that only desert plants can survive in it! Then why is the soil so poor in nutrients? For one thing, the rainy season has     4     impact on the soil. In this season, the water level can rise to more than 12 meters.     5     the water goes away, it takes away the nutrients in the soil. For another thing, due to the Amazon’s hot climate, it is difficult for the soil     6    (build) enough nutrients. Dead plants and animals     7    (break) down more quickly. The nutrients are soon taken in by the roots of the plants deep     8     the ground. As a result, most of the forest’s nutrients are locked up in the plants     9    (them), thus allowing them to grow at a(n)    10    (believable) speed.