D．researchers will spend more time in finding the causes of hunger in Africa

22.解析：推理判断题。根据Nienke Beintema 在第二段所说的Changes in food price，growing population，water shortage and climate change create the demand for better technologies or different technologies to address these issues可推断她希望增加研发新技术的投资。

答案：B

23．What does the underlined word "enhanced" in Paragraph 2 mean?

A．Changed. B．Increased.

C．Checked. D．Removed.

23.解析：词义猜测题。根据画线单词后面的after spending far too little in the past可知Nigeria以前在农业研究方面的投资很少。根据第一段的Nigeria was responsible for one－third of it可知这个国家现在这方面的投资很多，故可知Nigeria"增加"了在这方面的投资。

答案：B

24．Which of the following countries might NOT spend enough money on agricultural research in 2008?

A．Botswana. B．Burundi.

C．Uganda. D．Nigeria.

24.解析：细节理解题。根据第三段的But Nienke Beintema says a better measure is that a country spends more than one percent of its agricultural money on research.And in 2008，she says，Nigeria was not doing that可知应选D。

答案：D

25．According to the last paragraph，why aren't new researchers hired?

A．Because they are not qualified.

B．Because they are too old to be hired.

C．Because the budget for researchers is limited.

D．Because there are already enough researchers.

25.解析：细节理解题。根据末段的But the study has found that new researchers are not being hired in some countries because of budget problems.可知是因为预算太少才没聘这些新的研究人员。

答案：C

B

American families move from time to time，following employment chances all over the country. As a result，most Americans no longer live close to their relatives. There are many kinds of American families：traditional families with two parents and their children，mixed families created by divorce and remarriage，single－parent and gay parent households. Many families coming from other countries and areas in the world bring their own family traditions with them to America.

Most families live in suburban (郊外的) areas，only 20% in the countryside. Most American women work outside the home. Women have the same education and employment opportunities as men. They hold important positions in different areas.