题目内容
（请给出正确答案）
[主观题]
Mr. Ralph has just received an invitation from that university to join ______ as a full pr
ofessor.
A．association
B．committee
C．community
D．faculty
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根据树种耐荫程度的不同可将树种划分为三种：阳性树种、中性树种和()。
A.中生树种
B.旱生树种
C.耐荫树种
D.湿生树种
