问题
选择题
某园艺师将一株单色野生菊花，培育成具有多种颜色、多个花朵的“塔菊”。他采用的方法是 [ ]
A．扦插
B．嫁接
C．压条
D．分根
答案
答案：B
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某园艺师将一株单色野生菊花，培育成具有多种颜色、多个花朵的“塔菊”。他采用的方法是 [ ]
A．扦插
B．嫁接
C．压条
D．分根
答案：B
| 完形填空。 | |||
| We know that trees are useful in our everyday life. They __1__ us many things, such as wood, oxygen, rubber, medicines and many other things. They can __2__ tell us a lot about our climate. The following are the reasons. If you __3__ a tree, you can see that it has many rings. Most trees grow one new ring __4__ year. Because of the reason, we know __5__ a tree is. A tree over a hundred years old means that it has more than a hundred __6__ . When the climate is dry or very cold, the trees do not grow very much and their rings are usually __7__ . When it is wet and warm, the rings are much thicker. If the rings are suddenly very thin or suddenly very thick, this means that the __8__ changed suddenly. If we look at the rings on this tree, we can learn about the __9__ for a hundred years. We can see __10__ our climate is changing today. | |||
| ( ) 1．A．tell ( ) 2．A．not ( ) 3．A．cut across ( ) 4．A．every ( ) 5．A．how big ( ) 6．A．trees ( ) 7．A．big ( ) 8．A．climate ( ) 9．A．people ( ) 10．A．how | B．ask B．too B．climb up B．many B．how long B．leaves B．thick B．trees B．things B．why | C．give C．to C．walk past C．the first C．how old C．people C．small C．rings C．climate C．when | D．get D．also D．look at D．from D．how much D．rings D．thin D．animals D．life D．while |