27. What have Americans achieved in environmental protection?
A. They have cut car emissions to the lowest.
B. They have settled their environmental problems.
C. They have lowered their CO levels in forty cities.
D. They have reduced pollution through effective measures.
28. What is especially important for environmental protection according to the last paragraph?
A. Education.
B. Planning.
C. Green living.
D. CO reduction.
2017·四川卷]
D
With around 100 students scheduled to be in that 9 am Monday morning lecture, it is no surprise that almost 20 people actually make it to the class and only 10 of them are still awake after the first 15 minutes; it is not even a surprise that most of them are still in their pyjamas(睡衣). Obviously, students are terrible at adjusting their sleep cycles to their daily schedule.
All human beings possess a body clock. Along with other alerting(警报) systems, this governs the sleep/wake cycle and is therefore one of the main processes which govern sleep behaviour. Typically, the preferred sleep/wake cycle is delayed in adolescents, which leads to many students not feeling sleepy until much later in the evenings. This typical sleep pattern is usually referred to as the “night owl” schedule of sleep.
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