摘要：D 8.B 9.A 10.A 11.C
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There was a boy who was sent by his parents to a boarding school (寄宿学校). 36 being sent away, this boy was the 37 student in his class. He was at the top in every 38 always with high marks.
But the boy changed after 39 home and attending the boarding school. His grades started 40 . He hated being in a 41 . He was lonely all the time. And there were especially dark times when he 42 committing suicide (自杀). All of this was because he felt 43 and no one loved him.
His parents started 44 about the boy. But they even did not know what was 45 with him. So his dad decided to travel to the boarding school and 46 him.
They sat on the bank of the lake near the school. The father started asking him some casual questions about his classes, teachers and 47 . After some time his dad said, “Do you know, son, why I am here today?”
The boy answered back, “To 48 my grades?”
“No, no,” his dad replied. “I am here to tell you that you are the most 49 person for me. I want to see you 50 . I don’t care about grades. I care about you. I care about your happiness. YOU ARE MY LIFE.”
These words 51 the boy’s eyes to be filled with tears. He 52 his dad. They didn’t say anything to each other for a long time.
Now the boy had 53 he wanted. He knew there was someone on this earth who cared for him deeply. He 54 the world to someone. And today this young man is in college at the top of his class and no one has ever seen him 55 !
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But the boy changed after 39 home and attending the boarding school. His grades started 40 . He hated being in a 41 . He was lonely all the time. And there were especially dark times when he 42 committing suicide (自杀). All of this was because he felt 43 and no one loved him.
His parents started 44 about the boy. But they even did not know what was 45 with him. So his dad decided to travel to the boarding school and 46 him.
They sat on the bank of the lake near the school. The father started asking him some casual questions about his classes, teachers and 47 . After some time his dad said, “Do you know, son, why I am here today?”
The boy answered back, “To 48 my grades?”
“No, no,” his dad replied. “I am here to tell you that you are the most 49 person for me. I want to see you 50 . I don’t care about grades. I care about you. I care about your happiness. YOU ARE MY LIFE.”
These words 51 the boy’s eyes to be filled with tears. He 52 his dad. They didn’t say anything to each other for a long time.
Now the boy had 53 he wanted. He knew there was someone on this earth who cared for him deeply. He 54 the world to someone. And today this young man is in college at the top of his class and no one has ever seen him 55 !
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运动员在百米赛跑中，起跑的速度是9 m/s，中途的速度是8 m/s，最后冲刺的速度是10 m/s，如果他的成绩是12.5 s，则他全程的平均速度是
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A．10 m/s
B．8m/s
C．12.5 m/s
D．11.1 m/s
运动员在百米赛跑中，起跑时的速度为9米/秒，中途的速度是8米/秒，最后冲刺的速度为10米/秒，如果他的成绩为12.5秒，则他全程的平均速度是
[ ]
A．10米/秒
B．8米/秒
C．12.5米/秒
D．11.1米/秒
如图所示电路，电源电压保持不变，R1＝10 Ω，R2＝20 Ω，R3的阻值不为零，当开关S1闭合，S2断开时，电压表的示数为6 V，当开关S1、S2都闭合时，电压表的示数可能为
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A．6 V
B．8 V
C．9 V
D．11 V
将下列光学器件的字母序号填在适当的横线上：
A．白色不透明塑料板
B．孔屏(上面有小孔的不透明板)
C．平板毛玻璃
D．平板普通玻璃
E．三棱镜
F．点燃的蜡烛
G．通电的小灯泡
H．平面镜
I．凸透镜
J．凹透镜
(1)能够作为光源的是________；
(2)能够作为光屏的是________；
(3)同光的直线传播有关的是________；
(4)同光的折射有关的是________；
(5)能使光束会聚的是________；
(6)能使光束发散的是________；
(7)有两个实焦点的是________；
(8)能成等大像的是________；
(9)能成放大像的是________；
(10)只能成实像的是________；
(11)既能成实像，又能成虚像的是________；
(12)成的像只能用眼睛观察，不能用光屏承接的是________．
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