Jack （）so strong. He can lift the heavy boxes
A. was
B. is
C. be
D. will be
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釉质的哪一层抗龋能力最强
A. 表层0.1～0.2mm B．表层0.2mm以内
B. 中层
C. 内层
D. 各层抗龋能力一致
Kathy （）to South Korea more than five times
A. have been
B. has went
C. gone
D. has been
Our students are free to study () interests them.
A. that
B. which
C. whatever
D. anything
治疗慢性肾炎主要是
A. 消除蛋白尿
B. 消除血尿
C. 控制感染
D. 应用血小板解聚药
E. 防止或延缓肾功能衰竭
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