Some researchers believe that many patterns of nature are      rules of their own and not affected by natural selection．

A．making

B．breaking

C．following

D．bending

造成NSAID胃肠道损害的危险因素不包括( )。

A．有胃出血史、溃疡史
B．同时使用H₂受体拮抗剂
C．同时使用糖皮质激素
D．同时使用抗凝血药
E．大剂量使用NSAID