消石灰粒度细，亲水性强，而且有粘性，可以改善混合料制粒，因此配入量越多，效果越明显。（）
参考答案：错
________ people are concerned about now is the Shanghai World Expo, which ________ start on May 1st.
A．What; is due to
B．Which; is going to
C．That; is to
D．What; is about to
