问题
单项选择题
钴-60r线与加速器X线相比，钴-60半影大的原因是()
A.钴-60源直径大，准直器穿射半影高，旁向散射大
B.钴-60源直径大，准直器穿射半影高，旁向散射小
C.钴-60源直径大，准直器穿射半影低，旁向散射小
D.钴-60源直径大，准直器穿射半影相同，旁向散射小
E.钴-60源直径大，准直器穿射半影相同，旁向散射大
答案
参考答案：A
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钴-60r线与加速器X线相比，钴-60半影大的原因是()
A.钴-60源直径大，准直器穿射半影高，旁向散射大
B.钴-60源直径大，准直器穿射半影高，旁向散射小
C.钴-60源直径大，准直器穿射半影低，旁向散射小
D.钴-60源直径大，准直器穿射半影相同，旁向散射小
E.钴-60源直径大，准直器穿射半影相同，旁向散射大
参考答案：A
Passage Two
Which of the following statements is true according to the passage
A．Many people protested in the past six months.
B．Many people threw tomatoes at the German Chancellor.
C．Many people threw eggs at an important member of the German Chancellor’s Social Democrats.
D．Many people threw eggs at the German Chancellor, but he was not hit.