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【单选题】
引起回声增强的常见原因举例，以下那些不正确A.
均质的液体（如血液、脓液）中混有许多微气泡
B.
静脉内血栓的回声
C.
新鲜的出血、新鲜的血肿
D.
纤维化、钙化等非均质性改变
E.
肿瘤血供
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举一反三
【单选题】One day Jack's wife was cleaning the house. 'Look at all these umbrellas (雨伞) ,' Jack's wife said to him. 'There are eight and they are broken.' 'I'll take them all to the umbrella shop. Maybe the wor...
A.
She was doing some washing.
B.
She was doing some cleaning.
C.
She was doing some shopping.
【单选题】Look! Emma is_______ her bedroom. Her room is always_________.
A.
clean, clean
B.
clean, cleaning
C.
cleaning, clean
D.
cleaning, cleaning
【单选题】Look! The students ______ the classroom. [ ]
A.
clean
B.
are cleaning
C.
are clean
D.
cleaning
【单选题】Tom was playing football on the road. A car was coming, Jack called to Tom, 'Look out!'. Here 'look out' means ______. [ ]
A.
向外看
B.
当心
C.
向前看
D.
抬头看
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