题目

小强说可以用砖坯盖房子，又省时又省钱。请问他这种观点对吗？请解释原因。 答案：不完全正确，砖坯是没有经过高温烧制的砖，它还不是很结实，防水性不好，遇水会变形。单句改错 The reason why he didn't come was because he was ill. ________