B型超声波诊断仪的超声扫描及其显示方式的增多使病灶（）
A、清晰
B、准确
C、细致
D、具体
参考答案：A
We are all here _____ Tom, because he is ill at home. [ ]
A. except
B. beside
C. besides
D. excepts
______ the math problem is difficult, I'll try very hard to work it out. [ ]
A. Though
B. When
C. Before
D. After
