there any flowers in the nature park?[ ]
A. Am
B. Is
C. Are
答案：C
水下混凝土的灌注过程中，拆除导管动作要快，时间一般不宜超过（）min。
A．30
B．20
C．15
D．10
It depends on _______ he has enough money.
A．if
B．weather
C．if or not
D．whether
