在相对匀质的环境中,主要资源分布均匀的条件下,由于种群内个体竞争的结果,种群内个体常呈 ( )
A.随机分布
B.均匀分布
C.集群分布
D.随机和集群分布
参考答案:B
Such poets as Shakespeare _____ widely read, of whose works, however, some _____ difficult to understand.
[ ]
A. are; are
B. is; is
C. are; is
D. is; are
破窗理论告诉我们,不安全行为往往是受从众心理的影响。