—Who's that?
—I think _____ Bill. [ ]
A. his
B. she's
C. it's
D. that's
答案：C
选择正确的答语。
1. Jenny: Thank you.
Li Ming: _________[ ]
A. Sure.
B. You're welcome.
2. Danny: How many rulers?
Jenny: _________[ ]
A. Red rulers.
B. Three rulers.
3. Li Ming: How are you?
Danny: _________[ ]
A. I'm sad.
B. I'm six.
柴油发电机三相绕组对称嵌放，彼此电角度（相位）相差（）°。
A、60
B、120
C、180
D、360
