与人种的形成关系最密切的因素是[ ]
A．自然环境
B．人类基因
C．古猿遗传
D．饮食习惯
答案：A
The explanation given by the manager yesterday was not at all ______ to us.
A．satisfy
B．satisfied
C．satisfactory
D．satisfying
可持续发展的内涵包括生态、经济、社会的可持续发展。[ ]
