问题
选择题
物体放在凸透镜前适当位置能在屏上得到一个清晰的像，如果把屏拿开，则（ ）
A．像还存在，但眼睛看不到
B．像还存在，眼睛从各个方向看得到
C．像还存在，但眼睛只能在一定范围内看到
D．像不存在
答案
根据对实像和虚像的理解，可知此时成的是实像，光屏不在时像仍存在于原来的位置，人眼在这个位置之后可以观察到．
故选C．
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物体放在凸透镜前适当位置能在屏上得到一个清晰的像，如果把屏拿开，则（ ）
A．像还存在，但眼睛看不到
B．像还存在，眼睛从各个方向看得到
C．像还存在，但眼睛只能在一定范围内看到
D．像不存在
根据对实像和虚像的理解，可知此时成的是实像，光屏不在时像仍存在于原来的位置，人眼在这个位置之后可以观察到．
故选C．
May was born with a cleft palate(腭裂). When she was a little girl, she had to 36 the jikes from naughty chidren who teased her about her misshaped lip. With all the teasing, Mary grew up 37 the fact that she was“diffrernt”. She was 38 that no one, outside her family,could ever love her until she 39 Mrs. Leonard's class. In Mrs. Leonards' school at that time, it was 40 for teachers to give their children an annual 41 test. However, in Mary's case, 42 her cleft palate, she was hardly able to hear out of one ear. 43 not to let the other children have another“ 44 "to point out, she would 45 when her bad ear was tested each year. The “hearing test”was 46 by having a child walk to the classroom door,turn sideways, 47 one ear with a fingre, and then 48 what the teacher whispered. When Mary had to turn her bad ear towards her teacher she would 49 to cover her good ear. She knew that teachers 50 often say things like,“The sky is blue,”or“What color are your shoes?”But not on that day. Surely, God 51 seven words in Mrs. Leonard's mouth that 52 Mary's life forever. When the test came, Mary heard:“ I wish you were my little girl.”You can imagine how deeply these words 53 Mary. Yes, affirming (肯定）words are 54 to say to the people around you. While words from a godly teacher can soften a heart, words form you can powerfully set the 55 of another One's life.
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