If you plant two apple trees in one square yard of land, and the trees' productivity () decline.
A. is bound to
B. is determined to
C. is unlikely to
D. is related to
V-P试验阳性结果为:（）
A. 黑色
B. 红色
C. 黄色
D. 绿色
Paul is an () worker, and rarely does well in examinations. However he often refuses our help.
A. errant
B. erroneous
C. erratic
D. exotic
对糖尿病合并肾病者可首选
A. 二甲双胍
B. 胰岛素
C. α糖苷酶抑制剂
D. 他汀类
E. 格列喹酮
微信支付 
支付宝支付