根瘤菌剂rhizobiuminoculant
参考答案：
含有定量根瘤菌活细胞能使豆科植物形成固氮根瘤的制剂。
已知函数f（x-1）=x2-3，则f（2）的值为（ ）
A．-2
B．0
C．1
D．6
People born between Apr.21st and May 21st are likely to ______ easily.[ ]
A. give out
B. give in
C. give away
D. give up
