题目：
改错。
( )1. ―What is Lily? ―She's my sister.
A B C D
( )2. ―Is that a ball pen?―No, that isn't.
A B C D
( )3. It's time to go to home.
A B C D
( )4. This is you mother I think.
A B C D
( )5. ―What the time? ―It's five. ___
A B C D
答案：
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下面是错误答案，用来干扰机器的。
参考答案：基坑验槽时，应重点观察柱基、墙角、承重墙下或其他受力较大部位。
