【正确答案】 B

【答案解析】[听力原文] 26-28 Thomas Tommy Carter is a plant scientist in North Carolina．He works for the Agricultural Research Service in the United States Department of Agriculture．He leads Team Drought，a group of researchers at five universities．They have been using conventional breeding methods to develop and test soybeans that can grow well under dry conditions.Tommy Carter started working on drought-resistant soybeans in 1981．His research has taken him as far as China,where soybeans have been grown for thousands of years．Farmers in the United States，however，have grown soybeans for only about a century．Tommy Carter says the soybeans they grow are for the most part genetically similar．More differences，or diversification，could better protect crops against climate changes that can reduce production．Those changes include water shortages which could increase from global warming．The Agriculture Department has a soybean germplasm collection，a collection of genetic material passed from one generation to the next．Members of Team Drought studied more than 2,500 examples from the collection．They looked at ones from the ancestral home of soybeans，Asia．They searched for germplasms that could keep plants from weakening during hot, dry summers in the United States.Tommy Carter says they found only five.But these drought-resistant lines,he says,produce four to eight bushels more than normal soybeans under drought conditions．The yield depends on location and environment． [解析] 短文提到Tommy Carter的研究小组试图培育能在干旱条件下生长良好的大豆，之后又提到研究人员寻找在美国炎热干旱的夏季不易变得纤弱的种质，B与此相符，故正确。 [点睛] A虽然也与soybean有关，但短文中并未提到研究其相似性，故排除；C未提及；D的global warming虽然在短文中提到，但偏离主题，故也可排除。

【正确答案】 C

【答案解析】[解析] 短文提到Tommy Carter为研究抗旱大豆，他远道去到中国．因为中国有几干年种植大豆的历史，C与此相符，故为正确答案。 [点睛] ①浏览选项可知本题与China和soybeans有关。②A说法错误，可排除；短文提到大豆发源地是亚洲，没有具体说到是中国，故排除B；D“中国有不同种类的大豆”短文未提及。