A、
To find the similarity of soybeans in the world.
B、
To protect soybeans against dry condition.
C、
To collect materials for their papers.
D、
To study the impact of global warming.
【正确答案】
B
【答案解析】
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。
A、
China is the only country to grow soybeans.
B、
China is the ancestral home of soybeans.
C、
China has a long history of growing soybeans.
D、
China has different kinds of soybeans.
【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，因为中国有几千年种植大豆的历史，C与此相符，故为正确答案。
A、
They produce the same yield in different locations.
B、
They are suitable to grow only in the United States.
C、
They produce better quality soybeans under dry weather.
D、
They have better production under drought conditions.
【正确答案】
D
【答案解析】
解析：短文提到这5个种质在干旱的条件下比一般的大豆产量要高，D与此相符，故为正确答案。
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