诊断冠心病最有价值的检查是
A．超声心动图B．胸部X线片C．冠状动脉造影D．漂浮导管检查
参考答案：C
Because the children keep interrupting her whenever she reads a book, she is always _____ her place.
A．loosing
B．missing
C．losing
D．looking for
