Lin Tao and Li Gang _____ two radios. [ ]
A. have
B. has
C. are
D. is
答案:A
小民用三棱镜把太阳光分解成7种色光,其中色光的三原色是______.
大多数细菌增殖的最适pH是()。
A.pH7.2~7.6
B.pH8.4~9.2
C.pH6.5~6.8
D.pH5.5
E.pH5.0~6.0