229．（江苏常州武进区横山桥高级中学2011届高三上期中） ---Have you noticed the problem _______ the local students are still burdened with too much homework every day? How come?
--- Sure. It is mainly because of the fierce competition between schools .
A. why B. that
C. which D. how
230．（江苏丹阳六中2011届高三上期中）Recently some hospitals in China have adopted ______ they call a robot-doctor, ______ will be used to operate on patients with more accuracy.
A. what; that B. that; which
C. what; which D. which; what
