—Is there a lake? —No, there .[ ]
A. isn't
B. aren't
C. no
答案：A
— ______?
— It's July 2nd.
[ ]
A. What's the time now
B. What's the date today
C. What day is it today
D. When were you born
根据《防火门》（GB12955-2008）技术标准的规定，单扇防火门的代号为（）
A、1
B、2
C、3
D、4
