单项选择题
1、 水稻土属于（　　）
A．潜育土
B．泥炭土
C．盐成土壤
D．钙成土壤


2、 下列选项中不属于生物群落的组成成分的是（　　）
A．动物
B．植物
C．微生物
D．土壤


3、 经验证明，要使一个国家或地区的生态环境比较优越，其森林覆盖率要达到（　　）
A．10％
B．20％
C．30％
D．40％

4、回答题
    If the teacher asks a question, you are expected to give an answer．If you do not understand the　question, you should raise your hand and ask the teacher to repeat the question．If you do not know the answer, it is all right to tell the teacher that you do not know．Then he or she knows what you need to learn．There is no excuse for not doing your homework．If you are absent, you should call your teacher
or someone who is in your class and ask for the assignment．It is your responsibility to find out what assignments you have missed．It is not the teacher's responsibility  to remind you of missed assignments．You must not be absent on a test day．If you are seriously ill, call and let the teacher know you will not be there for the test．If your teacher allows make-up tests, you should take the test within one or two days after returning to class．Serious illness is the only reason for missing a test．Be on time! It is considered rude to be late．Also, it bothers other students．If you must come in late, be sure to do it quietly．Have your books and papers out of your bag before you come into the room．Then go to your seat and sit quietly．In the U.S．it is not necessary to knock before you enter the classroom．Most of the ELC teachers will give you a low grade if you are often late．Have your book out and be ready to begin when the class starts．Your teacher should not have to ask you every day to take out your book．Be sure you have a paper and a sharp pencil ready．

If you are puzzled with the question teacher asks, you should________first．
A．give an answer
B．raise your hand
C．repeat the question
D．ask for another question


5、
A．－3
B．－1
C．0
D．不存在


6、
A．F(x)
B．-F(x)
C．0 
D．2F(x)


7、 甲与乙签订了一份租赁合同。合同约定：如果甲父死亡，则甲将房屋租给乙居住。这一合同（　　）。
A．未成立
B．成立但无效
C．是附期限的合同
D．是附条件的合同


8、 下列各种土地使用权的取得方式中，属于无偿取得方式的是（　　）。
A．通过签订国有土地使用权出让合同取得
B．通过划拨土地取得
C．通过签订国有土地使用权转让合同取得
D．通过签订国有土地使用权租赁合同取得


填空题
9、 种群较长期地维持在几乎同一水平上，称为______。


10、

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