解析:推理判断题。根据最后一段内容可知,Harrison一家知道他一直在献血,但是直到她的女儿怀孕并需要注射Anti-D疫苗时,他的家人才清楚认识到溶血性疾病可能带来的后果,从而理解了他献血的意义。
C
In a few weeks,the halls of a school in Nanuet,N.Y.,will be full of mini race cars.The vehicles are carefully designed to achieve great speed.
But the cars’ makers aren’t college-level engineers;they’re middle-school students attempting to learn about physics and technology.“It’s rewriting what’s possible in education,”says Vinny Garrison,the teacher who organizes the races.
According to a survey,nearly three-fourths of U.S.teachers use technology to encourage students to learn.And that tech is getting smarter:students can now tour ancient worlds to learn history,take quizzes via smartphone and more.Most of the changes are designed to better prepare U.S.students for careers in fast-growing fields like science and engineering.But they can come at a cost.A $500 million plan to supply Los Angeles students with iPads was recently stopped after students found ways to avoid content filters(过滤器).
So far,however,research shows that using tech in the right ways can make students smarter and more creative.Here is a look at six new technologies that are shaping the classrooms of the future.
1.MakerBot has already placed more than 5,000 3-D printers in U.S.schools that are designed to help students create model cars(to learn about physics),model frogs(to learn about biology) and more.
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