单项选择题

Questions 17 to 20 are based on the following talk about American schools. You now have 20 seconds to read Questions 17 to 20.
In the western state of Colorado, how many hours do schools on the four-day week require per day

A．8 hours.
B．7. 5hours.
C．Shorter time.
D．Longer time.

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填空题

According to Rush Holt, America is producing ______ and engineers than they can use productively.

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Questions 17 to 20 are based on the following talk about American schools. You now have 20 seconds to read Questions 17 to 20. In the western state of Colorado, how many hours do schools on the four-day week require per day 您的浏览器不支持 audio 元素。