把成熟的苹果和未成熟的香蕉密封在一起，可促使香蕉成熟，这是由于苹果释放出了（）
A.乙烯
B.脱落酸
C.芳香族化合物
D.赤霉素
参考答案：A
解析：A．乙烯：促进果实成熟；正确。B．脱落酸：主要抑制细胞分裂，促进叶和果实的衰老和脱落，B错误。C．芳香族化合物不属于植物激素；错误。D．赤霉素：促进细胞伸长，引起植株增高；D错误。考点：乙烯的功能
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| In these years, computer games have been more and more 1 in many cities and towns. A lot of small 2 along busy 3 have changed into computer game houses in order to get more money. These places are always crowded with people especially young boys. In the computer game houses, people spend a lot of money 4 with the machines. It’s hard for one to win a computer, but can make progress( 进步)after 5 again and again. People have a kind of gambling psychology(赌博心理)when they play computer games. The more the lost, the 6 they want to win. For school boys, they have no time for their 7 . When class 8 , they run to the nearby computer game houses. Some of them can get enough money from their parents, but some of them are not 9 enough to get the money. A few of them begin to take away othe 10 money and become bad boys. |