题干

下列关于实验“土壤中小动物类群丰富度的研究”的说法,不正确的是(    )

A:为调查不同时间土壤中小动物类群的丰富度,分别在白天和晚上取同一地块的土样

B:许多土壤小动物有较强的活动能力,采用标志重捕法调查土壤小动物类群的丰富度

C:利用小动物的避光、避热性,收集土样中的小动物时可采用带灯罩的热光源

D:对于无法知道名称的小动物,不可忽略,应记录下它们的特征

上一题 下一题 0.0难度 选择题 更新时间:2012-07-13 09:36:33

答案(点此获取答案解析)

B

同类题4

阅读理解

    Many students want to give gifts to their teachers, and they often wonder what gifts to give to their teachers. After almost two decades as a teacher, here are some thoughts.

    First, not giving your teacher anything is perfectly fine. Teachers do not expect to receive a gift and are often surprised when they receive a gift. Believe it or not, the gift that a teacher receives (or does not receive) has no influence on his or her opinion of the child. No teacher will ever remember which child arrived at school with a gift and which did not. Trust me. In fact, many schools do not allow teachers to accept gifts from parents, so offering a gift can place a teacher in a difficult situation. As a result, no gift is sometimes just easier for a teacher.

    But if you're going to give your teacher a gift, here are a few suggestions:

    The best gift I ever received from students was given to me when my daughter was born. Each student in my class bought his or her favorite childhood book and signed the inside cover with a message to Clara. These books were then put into a library and gathered to me after Clara's birth. The books in that library are still some of Clara's favorites today, and we always take a moment to read the messages.

    Two things to take away from this: Books make excellent gifts. Gifts for a teacher's children make excellent gifts.

    But when it comes to gifts, I believe that the best gift that you can give a teacher is simply a note expressing your appreciation for all that he or she has done for you. I have letters from students that I appreciate (感激) as much as any other object in my life. I read these letters after difficult days in the classroom. They lift my spirits beyond measure.