B.the giraffes often go out in the park alone
C.the best time to see polar bears is in autumn
D.manatees are the most difficult animals to raise
【解析】 推理判断题。根据每三段中的“...thanks to the cute white bears that visit in the fall.”以及“These polar bear viewing tours run from early October to midNovember.”可以推测,观看北极熊的最佳时间是在秋天。
【答案】 C
30.The intended readers of the text are________.
A.tourists
B.geographers
C.environmentalists
D.officials
【解析】 推理判断题。本文说明了观看四种动物的最好的地点,其读者对象应该是旅游者。
【答案】 A
B
We see with our eyes,and sight tells us about the things outside our bodies.
Light strikes things,bounces off them,and enters the eyes through the pupils(瞳孔).After that it passes through a lens (水晶体)in each eye.The lenses focus the image of the thing you are looking at,but also turn it upside down!When the upsidedown image reaches the back of the eye,it strikes the retina.The retina contains the optic nerve that sends the image to the brain.
It's the brain that decides what you are seeing,and what to do.When you look at the word“CAT”,your eyes send the image to your brain,but it's your brain that figures out or remembers the word,and reads it.
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