题目

Joe wanted a computer. He asked his  1   for the money, but they said he must get it himself.  But   2   did he get it? He thought about this for a long time. Then he saw one of his classmates, Dick, delivering (送)  3  . I could do that, he thought. Maybe I could even get the computer right away.  I could pay for it a little each week. He ran to   4   up with Dick. Joe asked him a lot of questions. He learned that it was  5   to get twenty dollars each week. He learned that the job   6   about three hours each night. Dick   7   him the phone number of the newspaper 图中分别表示甲、乙两个生态系统的食物网，据图回答下题： 1.若人类对两食物网中的鼠大量捕杀，则受到影响最严重的生态系统是 A．甲生态系统 B．乙生态系统 C．甲、乙两生态系统受影响程度相同 D．无法判断 2.乙生态系统中猫头鹰和蛇的关系是                  A．捕食             B．竞争             C．捕食和寄生        D．捕食和竞争