题干

控制鲫鱼身体前进方向的器官是(  )

 

A:腹鳍

B:背鳍

C:胸鳍

D:尾鳍

上一题 下一题 0.0难度 选择题 更新时间:2019-01-01 07:57:05

答案(点此获取答案解析)

D

同类题1

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Mini Book Excerpts (节选)

    Biography

    When Salinger learned that a car park was to be built on the land, the middle-aged writer was shocked and quickly bought the neighboring area to protect it… The townspeople never forgot the rescue and came to help their most famous neighbor.

    J. D. Salinger: A Life by Kenneth Slawenski (Random House, $ 27)

    Mystery

    “You're a smart boy. Benny's death was no accident, and you're the only one who saw it happen. Do you think the murderer should get away with it?” The boy was staring stubbornly at his lap again.

    A thought suddenly occurred to Annika, “Did you... You recognized the man in the car, didn't you?”

    The boy hesitated, twisting his fingers. “Maybe,” he said quietly.

    Red Wolf by Liza Marklund (Atria Books, $ 25.99)

    Short Stories

    She wants to say to him what she has learned, none of it in class. Some women are born stupid, and some women are too smart for their own good. Some women are born to give, and some women only know how to take. Some women learn who they want to be from their mothers, some who they don't want to be. Some mothers suffer so their daughters won't. Some mothers suffer so their daughters won't.

    You Are Free by Danzy Senna (Riverhead Books, $ 15)

    Humor

    Do your kids like to have fun? Come to Fun Times! Do you like to watch your kids having fun? Bring them to Fun Times! Fun Times's “amusement cycling” is the most fun you can have in the United States right now. Why spend thousands of dollars flying to Disney World when you can spend less than half to that within a day's drive in most cities?

    Happy And Other Bad Thoughts by Larry Doyle (Ecco, $ 14.99)

同类题3

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    China is fully prepared to export a full supply chain of high-speed railway technology, according to industry experts.

    China Railway Corp, the national rail operator, said exports of railway equipment and railway construction projects are proceeding well, and breakthroughs are being made in a number of projects overseas.

    Among the projects, the first full-chain commission, the Jakarta to Bandung high-speed railway in Indonesia, which includes technology, design, construction, equipment manufacture, supply of resources, operations management and staff training, has been granted a construction permit and work is proceeding smoothly.

    “China's railways have established a comprehensive and advanced technology system, which is able to provide overseas customers with solutions from many different perspectives, including financing, construction, operations, and research and development,” said Yang Zhongmin, the CRC's deputy chief engineer, who added that China's railway system is competitive in terms of technology and economy of use.

    According to Yang, the nation's railway equipment and infrastructure (基础设施) service businesses have entered markets in Asia, Europe, North America and Africa.

    Last year, Joko Widodo, president of Indonesia, and Malaysian Prime Minister Najib Razak, rode Chinese-made bullet trains.

    Yang Hao, a professor of rail transportation management at Beijing Jiaotong University, said China has a major advantage in that it is able to export a full range of railway technology: “For example, it is inconvenient to import the technology for the signaling system from one country and civil engineering technology from another.”