问题
判断题
超声耦合是指超声波在探测面上的声强透射率。
答案
参考答案：对
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超声耦合是指超声波在探测面上的声强透射率。
参考答案：对
| 完形填空。 | |||
| Laura lived in a small village near the sea. One day she decided to go for a swim in the sea. She knew that the sea near the __1__ has a strong tide (浪) , but she was a good swimmer, so she wasn’t __2__. Laura left her friends lying on the sands and ran into the sea.She swam quite far from the beach and waved( 挥舞 )to her friends in the distance. After a short while she decided to swim __3__. She tried her best, but she couldn’t get any closer to the beach . The tide kept__4__her back. She waved her arms in the air to let her friends know that she was__5__, but they just waved back, for they didn’t know what she__6__. After a long time, Laura became very __7__ and she couldn’t swim any more. Her legs __8__and she lost hope. Suddenly, her foot touched __9__! All the time she had been swimming in a place where the water wasn’t deep! When at last she went back to the beach, one of her friends asked, " Did you _10_your swim?” “Yes, it was lovely.” She answered. She never told them what really happened. | |||
| ( )1. A town ( )2. A lonely ( )3. A up ( )4. A pulling ( )5. A in trouble ( )6. A found ( )7. A hungry ( )8. A came up ( )9. A a tide ( )10. A enjoy | B city B surprised B back B pushing B happy B meant B sleepy B were broken B the sand B remember | C village C interested C down C throwing C out of trouble C said C thirsty C went down C a fish C drop | D country D afraid D on D putting D in the water D saw D tired D moved on D one of her friends D forget |