5. To produce active chips,the problems designers need to solve are as many as — —

　　A two B three

　　C four D five

　　1.D細節理解題。根據第二段第一、二句“…if your child has fallen and needs immediate help. Once paramedics arrive ,the chip will also be able to tell the rescue workers…”得出此結論。

　　2.A猜測詞義題。根據第四段第一句“To some ,this may…”得出此結論。

　　3.D推論題。根據第七段最后一句話“It’s a double-edged sword.”得出此結論

　　4.D細節理解題。根據第十一段第一句“The company says it has recently…”得出此結論。

　　5.C細節理解題。根據文章最后兩段敘述得出此結論。