A. The man’s doctor.
B. The man’s wife.
C. The man’s secretary.

A. hopefully
B. gradually
C. truly
D. eagerly

A. The man’s doctor.
B. The man’s wife.
C. The man’s secretary.

     Once considered a fringe(非主流的)food by the U.S. culinary mainstream, sweet potatoes are
fast becoming popular everywhere from fast food chains to expensive restaurants and the White
House table.
    Three years ago, the "Wall Street Journal" wrote in a front page article that except for their use in
a Thanksgiving dish, sweet potatoes were a wholly uninteresting food. Yet over the past two years,
the number of restaurants offering a sweet potato-based side dish has increased 40 percent. Food
giant ConAgra just spent $155 million to open the world's first plant devoted entirely to frozen sweet
potato products, and U.S. farmers are planning to harvest a record-setting 2 billion pound crop.
    "It's not something we believe is a fashion,"said Andy Johnston of ConAgra Foods Lamb Weston.
    According to research conducted by ConAgra, 30 percent of sweet potato eaters report consuming
the vegetable several times per month. Only 12 percent eat them only during the Thanksgiving and
winter holiday season.
    Analysts attribute the sweet potato's growing popularity in large part is due to sweet potato fries,
which account for the majority of the vegetable's presence in U.S. restaurants. In fact, Google searches
for "sweet potato fries" increased 40 percent over the past year.
    Sweet potatoes have also become popular among more conscious eaters, however, in part because
they are high in vitamins and have a low glycemic (血糖的) index in spite of their sweetness. Both
Weight Watchers and the South Beach Diet have recommended sweet potatoes, roasted in a little oil
rather than fried, and doctors are recommending them for diabetics.
   "Within the diabetic community, it's become pretty common knowledge that sweet potatoes are good
for you, so there's a great appeal because so many people have diabetes now,"said Chef Michel Nischan, who helps host a TV show for people with diabetes.

      As a boy growing up on a farm near the Caribbean coast of Colombia(哥伦比亚), Alvaro
Cogollo loved both plants and vallenato, the traditional music of the region.As a biology student
in the 1970s, Cogollo traveled around the country to document its rich botanical heritage and,
informally, studied the music that tells an important story of Colombia.
     "We were colonized by the Spanish; later, Africans were brought as slaves to exploit gold
mines; and the native peoples were already here," he says."That is what authentic vallenato
represents with its three instruments: the accordion(手风琴), from a European origin; la caja drum,
which is of African origin; and la guacharaca, a beating instrument made from a palm tree, which is
from native American origin."
     Over the course of his nearly four-decade career, Cogollo has discovered more than 150 new
species of plants, 17 of which bear his name.Although Cogollo never earned a PhD, his colleagues
say he's made invaluable contributions to knowledge of Colombia's plant at a time when deforestation
(砍伐森林) is a big threat to the country' s biodiversity.Governments have focused on trying to move
 the country out of poverty and conflict through exploiting its natural resources, not through scientific
resource development.But Cogollo sees things a different way.By educating the public about alternative
uses for the land, and researching plants' potential uses-including as medicines, foods, and bio-fuels-
Golombia could improve its economy and quality of life without neglecting conservation, Cogollo says.
     Cogollo's other major achievement has been the transformation of a neglected botanical garden in a
Medellm neighborhood into a well-known center for research, environmental education, and community
gatherings.What had been a club for wealthy orchid enthusiasts now offers free admission and attracts
rich and poor alike.The success of the botanical garden has in turn contributed to the transformation
of Medellm.Once seriously damaged, by violent wars between armed groups, the city has had some
improvements that include better public safety, tougher pollution controls and the creation of green
spaces.
     What Cogollo has focused his latest efforts on is teaching Colombians from all social classes and
backgrounds about the importance of biodiversity and conservation through a shared musical heritage.
"The fact that Alvaro's been able to give talks to audiences filled with all kinds of people is very
important, and that's what happened in Medellm the first time he talked about vallenato music,"
Dr.Forcro says."People sitting there had no idea of environmental conservation, and then they did."