问题
单项选择题
超声诊断利用超声的主要物理原理是（）。
A.辐射
B.反射
C.衍射
D.散射
E.折射
答案
参考答案：B
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超声诊断利用超声的主要物理原理是（）。
A.辐射
B.反射
C.衍射
D.散射
E.折射
参考答案：B
Last Tuesday I took my two daughters, aged five and seven, to town by car. It began to rain__26__ so I decided I would leave the children in the car__27__ I rushed into a shop. I warned the girls not to  __28_ anything and told them I would be __29__ within a few minutes. Then I locked all the doors and left  __30__happily looking out of the window.I returned to the car in less than five minutes but the girls had __31__! I could hardly believe my __32__. The car doors were __3  3__ locked, the windows tightly shut and on the back seat __34__only two coats. Being____ __35__, I ran to the corner of the street __36__ there was no sign of them. I __37__up to an old lady nearby and asked __38__ she had seen two small girls but she said “No”.Feeling quite sick with fear, I sat on the driver’s seat, and __39__ to stop trembling(发抖). Suddenly, I __40__ a merry laugh __41__ me. I got out of the car, ran round to open the boot(车尾行李箱) and __42__ were two very red-face and _43__ children. They had obviously pulled out the back seat, __44__ behind it and then been unable to push the seat forward again. __45__ tears in my eyes, I leaned forward and pulled their ears.
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hemselves