题干

根据现代生物进化理论,下列说法错误的是( )

A:种群基因频率的改变是产生生殖隔离的前提条件

B:自然选择、突变或种群过小,都可能导致种群基因频率发生变化

C:自然选择过程中,直接受选择的是表现型,进而导致基因频率的改变

D:同一物种不同种群基因频率改变会导致基因库的差别变大,但生物没有进化

上一题 下一题 0.0难度 选择题 更新时间:2015-01-15 04:15:46

答案(点此获取答案解析)

D

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完形填空

    Last year I broke the record for the oldest person in the world to ride a rollercoaster. I'm 105, but the doctor agrees I'm in good 1

    The rollercoaster I rode 2 you round quite fast. It was, however, a bit too 3for me. I'd have preferred a really fast one that went upside down. But I was told I couldn't ride it, because my blood pressure could drop and I might have 4

    I wasn't nervous. I was securely 5 in, so I knew I wouldn't fall out. The rollercoaster ride went on for three or four minutes, and I 6 every second. Later, someone came to 7 me with the Guinness World Records Certificate.

    My 8 ways really began a couple of years ago, with the ice-bucket challenge. My great-granddaughter recommended me to have a bucket of 9 water poured on my head. I was 102 then. It 10 that I was the oldest person in the world to do it, and the video clip of me was very 11 After that, I started to think about what else I could do for different 12My family say I'm crazy, but they always go along with me. I do get people 13I take it easy, but I'm not taking any14.

    If someone now broke my world record, I'd say, “Good luck to you.” But the real15 is not what I've done; it's how hard I've always worked. I'm taking it easy now, so I have found a new challenge. I was suspended on a rope from a crane about 25 feet high and 16myself down. It was fun.

    I've got a few ideas for the next charity challenge on my 106th birthday, but nothing has been 17yet. All I can say is that it will be 18 good, if not better than the rollercoaster.

    I'm not sure if anyone is19 of all the fun I'm having. They just say I'm silly and that's about it. On 20I've had many good days. I've had a really good life.