1935年1月，中央红军主力强渡什么天险，占领了遵义？
参考答案：
乌江天险。
Great changes have taken place in that school. It is no longer _______ it was 20 years ago, _______ it was so poorly equipped.
A．what; when
B．that; which
C．what; which
D．which; that
养殖水体应保持的最佳水色是（）。
A、淡绿色
B、蓝绿色
C、黄绿色
D、暗绿色
