Scientists in Uganda conduct (实施) a study. They are studying 51 wild chimps (黑猩猩). The chimps eat special plants to help them feel better. These special plants can stop pain and kill bacteria (细菌).

    Scientists have been studying the chimps for four years. They follow the chimps and see what they eat when sick or hurt. The scientists take those plants and test them. They think this can help in finding new medicines (药) for people.

    The study shows that many plants stop bacteria and help with pain. This means that the chimps know which plants can help them. They are smart.

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1.Why do wild chimps eat special plants?

A For unknown reasons.

B To help them feel better.

C To make a living.

D To feed their children.

解析：选B。B细节理解题。根据第一段第三句“The chimps eat special plants to help them feel better.”可知，这些野生黑猩猩用草药来治疗它们的伤痛或疾病。故选B。

2.How long have scientists been studying the chimps?

A For 6 years.

B For 5 years.

C For 4 years.

D For 3 years.

解析：选C。C细节理解题。根据第二段第一句“Scientists have been studying the chimps for four years.”可知，研究人员已经对黑猩猩进行了四年的观察。故选C。

3.What does the underlined word “them” refer to?

A Bacteria.

B Chimps.

C Scientists.

D Plants.

解析：选D。D词意指代题。根据划线部分前面的“The scientists take those plants”可知，研究人员收集了这些植物的样本来进行研究测试。故选D。

4.Do the chimps help with the field of medicine?

A Yes, they do.

B No, they don’t.

C Yes, they will.

D No, they won’t.

解析：选A。A推理判断题。根据第二段最后一句“They think this can help in finding new medicines (药) for people.”和第三段第一句“The study shows that many plants stop bacteria and help with pain.”可知，这些黑猩猩使用的植物可以帮助开发有价值的新药，因此它们对医学领域有帮助。故选A。

5.From the text, we can know the chimps are ___________.

A strict

B clever

C lazy

D quiet

解析：选B。B细节理解题。根据第三段最后一句“They are smart.”可知，这些野生黑猩猩很聪明。故选B。