瓷砖材料质地疏松有隐伤，施工前瓷砖浸泡不透，粘贴砂浆保水性差，会造成瓷砖的______。
A．裂缝
B．变色
C．空鼓
D．以上都可能
参考答案：D
除规范另有规定外，甲类厂房与明火或散发火花地点的防火间距不应小于()米。
A．20
B．30
C．40
D．50
填空。
1. Fish is healthy food_____ candy isn't healthy food.
2. He is from China _____ he is Chinese.
3. Is he a doctor _____ a teacher?
4. He does sports every morning, _____ he is in good health.
5. 我的眼镜在课桌上。
My_____ _____ on the desk.
