对水泥不但有一定的细度要求，而且要有合理的颗粒级配，要求大于0.080mm的颗粒占主要部分。
参考答案：错
We noticed that each animal and each tree in the park _____ being taken good care of.
A．are
B．is
C．were
D．was
甲类传染病
