编号为1至10的十个果盘中，每盘都盛有水果，共盛放100个。其中第_爱下问搜题

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问题单项选择题

编号为1至10的十个果盘中，每盘都盛有水果，共盛放100个。其中第一盘里有16个，并且编号相邻的三个果盘中水果数的和都相等，求第8盘中水果最多可能有( )。

A．9个

B．12个

C．8个

D．11个

答案

参考答案：D

解析：编号2到10的九个果盘中共有100-16=84个，编号相邻的二个果盘中水果共有84÷3=28个；编号相邻的三个果盘中水果数的和都相等，所以1、4、7、10号盘水果数， 2、5、8号盘水果数和3、6、9号盘水果数分别相等。8、9号两盘水果总数为28-16=12个，而9号盘至少有1个水果，所以8号盘中最多有11个水果。

完形填空

Mike was a little boy. One day Mike went with his father to      his grandparents by train.      the train, Mike put his head out of the window. His father said, “Mike, be      ! Don’t put your head out of the window!” But Mike didn’t       his father. His father could do      .
Then Mike’s father wanted to        a joke on his son. He took Mike’s cap quietly, hid (藏) it      his back and said, “You see, your cap has flown（飞）      .” Mike touched his head and it was really gone. The boy looked      and then he began to cry. He wanted to get his cap back.
“Don’t worry, son.” said his father, “I have a strange      to get your cap back.” “    can you get it back?” asked Mike in surprise.
His father said, “Close your eyes and whistle（吹口哨）once, and maybe your cap will come back.” Mike came       to the window, closed his eyes and whistled. Just at that       , his father quickly put the cap on the son’s head.
“Oh! It is       !” Mike laughed. He was pleased, then he quickly took his father’s cap and       it out of the window. “Now it is your turn to whistle, Dad!” he said happily.

不定项选择

一个从地面竖直上抛的物体，它两次经过一个较低点a的时间间隔是T_a，两次经过一个较高点b的时间间隔是T_b，则a、b 之间的距离为 [ ]

A．

B．

C．

D．