Some children have never seen a dentist before starting school.（）
A. Right
B. Wrong
C. Not mentioned
53（）
A. which
B. that
C. this
D. what
单纯性机械性肠梗阻可采用
A. 充分准备后，择期行肠切除术
B. 抗生素治疗
C. 立即手术，去除病因
D. 中西医非手术治疗与观察
E. 腹部热敷
Paragraph 1（）
A. How is cancer treated
B. Does cancer always cause pain
Can cancer be prevented
D. What is cancer
E. How common is cancer
F. What causes cancer
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