中学英语单词细节知识点复习speed和spell和spend等
speed  [spiːd]
n. [U]速度 ‖ v.（使）加速    
You should drive at the speed of traffic.你应该以规定的速度行驶。[at the speed of以……的速度〕
短语：1. speed up 加速
      2. at speed  高速，快地
eg: It’s dangerous to go round corners at speed 高速转弯是危险的。

spell  [spel]
 v. 拼写；带来        
He gave his name and then helpfully spelt it.他说自己的名字，然后又热心地将它拼了出来。
短语：1.spelling mistakes 拼写错误
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spend (spent, spent) [spend] 
v.○1花费（钱，时间等）；○2度过  
She spent three hours(in) watching TV.她看电视耗掉了三个小时。
He doesn't spend much time on his homework.他花在做作业上的时间不多。
短语：1.spend .......on sth  用钱 ，花钱
      2.spend ........(in )doing sth 花时间/钱做什么
      3.spend time with sb  与某人一起度过时光 

spirit  ['spɪrɪt]
n.[U]精神；灵魂         
e.g. His spirit is troubled.他内心苦恼。
短语：1.in spirit  在内心，在精神上
eg: I shall be with you in spirit.我的心和你在一起。

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。 
We always think it's OK for us to leave our plants unattended during our vacation, but a recent study has led to a new 61_____(discover). 
Some scientists tested tobacco plants and tomato plants by cutting off their stems(茎）and 62_____(stop)watering them. They then recorded their response with a microphone 63 ____（place)ten centimeters away. 
They found that the plants began to scream ultrasonic(超声波）sounds, which they believed could convey their suffering 64____ other plants. When the stem of a tomato plant was cut, the scientists found that 65_____ screamed 25 ultrasonic sounds of suffering within an hour. The tobacco plant that had its stem cut 66_____(send)out 15. 
The plants also seemed to respond to different 67______(stress)with the different intensities(强度）of sound. The scientists observed that the tobacco plants let out 68 _____（loud)sound when they were not watered than when they had their stems cut 
The study answers the question69 _____plants can feel pain or not. It can change the way that we think about the plant kingdom, which has been 70_____(natural)considered to be almost silent. 
答案
61. discovery    62. stopping     63. placed      64. to          65. it 
66. sent 67. stresses      68. louder     69. whether     70. naturally

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