3．This passage in general is about ________.

　　A．Halley and other scientists

　　B．the orbit of a comet

　　C．Newton and Halley

　　D．Halley and his discovery

　　解析：选D。主旨大意题。纵观全文，不难看出，文章的中心就是哈雷以及他的发现。

　　4．Which of the following is TRUE?

　　A．Edmund Halley was an American scientist.

　　B．Halley made his discovery by doing experiments.

　　C．Newton was a famous mathematician.

　　D．The orbit of a comet had the shape of an around.

　　解析：选C。综合判断题。从文章首句可以看出A项错误；从第二题的分析中可知B项也错误；牛顿告诉哈雷彗星的轨道是椭圆形的，可排除D。

　　B

　　Do you enjoy watching beautiful sunsets and seeing wildlife in some of the best parts of Wisconsin? Do you like being around people who share the same respect and love for natural resources? If you say “yes”， then a fisheries biologist is a great career choice for you.

　　As you can probably guess, education is very important.A Bachelor of Science degree in fisheries or biology is strongly recommended.Many biologists have a Master's degree.But it's not only good education that prepares you for a career as a fisheries biologist — field experience is also important.Volunteer work, internships (实习) and short­term fish technician positions are good ways to gain valuable training that can give you an edge in the competitive job market.

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