Read this excerpt from "Heads Up on Sports Safety."

Your neck can also get hurt while playing football, so many helmet designers are using materials that prevent neck injuries. One common injury is whiplash, which is a sudden hit to the head that moves the neck very quickly. Neck padding can help, but materials that prevent the head from turning can decrease athletic performance. One alternative is to use a thermoplastic material that responds differently to different kinds of pressure. This material is soft when moved or pressed slowly but stiffens into a hard version of its shape when hit quickly. It has been used in bulletproof vests for at least a decade.
One problem and its solution presented in this article is

A. the possibility of whiplash and the use of thermoplastic material to prevent the neck from turning very quickly.
B. the efforts made by helmet designers to find new protective materials and the use of thermoplastic material to prevent neck injuries.
C. the fact that neck injuries can be hard to avoid and the occurrence of whiplash when the head moves quickly.
D. the probability of head injuries in sports and the use of bulletproof vests by athletes to stay safe.

Lesson 10: crossing borders: unit test “borders” 1.what does the mother’s refusal to state her nationality as canadian or american signify? a)that she resents governmental interference with her life b)that she identifies with neither country c)that she comes from somewhere else d)that she is stubborn and proud 4.the author’s chosen visual images,sensory details, and dialogue all convey a particular feeling in “delfino ii: diez in the desert.” thus feeling is known as: a)tone b)mood c)pathos 5.compare and contrast the poem “mexicans begin jogging” and the story “delfino ii: diez in the desert.” a)both are written about similar themes (immigration), but the story has a more serious mood than the poem b)both focus on mexican immigrants, but the story has a lighter tone than the poem. c)both main characters are afraid: diez is afraid of being caught smuggling people over the border, and soto is afraid of being caught working illegally. d)the tone in both selections is similar, but the subject matter differs slightly. 15. the tone of the poem “ka’ba” versus the tone of the poem “harlem ii” might be described as a)grateful vs ungrateful b)certain vs doubtful c) hurtful vs defeated d)safe vs dangerous