【名词&注释】
生态系统(ecosystem)
[单选题]在一个稳定的生态系统中,可以没有( )
A. 植物
B. 动物
C. 细菌和真菌
D. 人类
查看答案&解析查看所有试题
学习资料:
[单选题]24.________ in Grade Eight now.
A. John and his sister are both
B. John is
C. John's sister is
D. Michael is
[单选题]13. "It dawned on me probably means "_________ ".
A. I began to understand it
B. it cheered me up
C. I knew it grew light
D. it began to get dark
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