问题
选择题
关于现代生物进化理论，说法不正确的是[ ]
A．种群的基因频率常常发生改变
B．地理隔离一定会导致生殖隔离
C．生殖隔离一旦形成，就产生了新物种
D．一个种群构成一个基因库
答案
答案：B
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关于现代生物进化理论，说法不正确的是[ ]
A．种群的基因频率常常发生改变
B．地理隔离一定会导致生殖隔离
C．生殖隔离一旦形成，就产生了新物种
D．一个种群构成一个基因库
答案：B
Some years ago, Chinese high school students would show their new schoolbags , new clothes or new pens to their classmates when the new term started . Today, however , all have . If you still come back to school only these things , you are falling out-of-date(过时的) . Students in big cities like to bring the latest high-tech things to school, and feel happy and to show off these things to . Mobile phones, MP3 players , CD players , electronic dictionaries , the list is endless . Young people think that , living in the 21st century , they must keep up with the . They don't want to fall . Besides, they think they need to keep in touch with their classmates , so they need mobile phones . They also like to the pop music , so they need CD players . They explain that, like electronic dictionaries , these can be in their study , . They think that their parents should understand they want these things . Foreign students will also bring some latest high-tech things when they to school at the beginning of a new term. , they often use the money which they made by themselves during the holiday to these high-tech things that they want .
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