问题 选择题

俗话说,树“不怕空心,就怕剥皮”,其中的道理是 [ ]

A.树皮中有筛管,能运输水分

B.树皮中有导管,能运输水分

C.树皮中有筛管,能运输有机物

D.树皮中有导管,能运输有机物

答案

答案:C

填空题

请用英文写出下列算式的表达法。

1、9+2=11                                                                         

2、36-6=30                                                                                      

3、58+50=108                                                                                                    

4、92-48=44                                                                                

5、5+9=14                                                                      

6、13+27=40                                                                                      

7、78-63=15                                                                                        

8、114-56=58                                                                                                

9、77-77=0                                                                                                

10、6+19=25                                                                                 

判断题