某一引发体系引发聚合时有如下特征：(1)加水有阻聚作用；(2)溶剂极性增加，聚合速率加快；(3)分子量随温度升高而下降；(4)聚合速率随温度升高而下降；(5)引发St(MI)-MMA(M2)共聚时，r₁＜1、r₂＞1。
判断这一聚合是按自由基、阳离子还是阴离子聚合机理进行的？理由是什么？

A. 共同受益人按照信托文件的规定享受信托利益
B. 受益人可以放弃信托受益权
C. 受益人不能清偿到期债务的，其信托受益权可以用于清偿债务
D. 受益人的信托受益权仅能自己享有，不得继承和转让

A. There is still a good chance of their being recovered.
B. There is an urgent need for them to be reconstructed.
C. They have stopped sending homing signals.
D. They were destroyed somewhere near Brazil.

A. Shooting them．
B. Poisoning them．
C. Asking the local hunt to hunt for them．
D. All of the above．

A. Highway 40.
B. Highway 14.
C. Highway 90.
D. Highway 19.