D．show a lot of interest in new technology

　　10．Which of the following can describe the Hadza's environment?

　　A．Stressful.

　　B．Comfortable.

　　C．Exciting. D．Dangerous.

　　1．The relationship between the Hadza and nature

　　.

　　A．is going wrong B．is full of conflict

　　C．is in perfect harmony D．is changing all the time

　　2．Why does the author come to visit the Hadza?

　　A．To study their native language.

　　B．To get to know their way of life.

　　C．To learn survival skills from them.

　　D．To persuade them to protect animals.

　　D

　　Testing new drugs for safety and effectiveness is a costly process in the United States. It also can take a lot of time. Some scientists are now designing silicon computer chips (硅计算机芯片) that act like human organs. The scientists think they have found a way to make the process faster and more economical.

　　The silicon computer chips are smaller than a child's hand. Each one has living cells that act and react like a human organ. The chips are being created as part of a program to test the safety of

　　drug compounds. It is called the Tissue Chip for Drug Screening Program.

　　It is a project of the US National Center for Advancing Tmnslational Sciences, or NCATS.

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