小题1:Sydney Tower is ____________ in Sydney, Australia.

A．the busiest street

B．the biggest station

C．the most beautiful park

D．the highest point小题2: Sydney Tower opens at ____________.

A．8:00 am

B．9:00 am

C．10:30 pm

D．11:30 pm小题3: If an adult with two children goes to visit Sydney Tower, he has to pay ___________.

A．$60

B．$90

C．$120

D．$150

气相色谱法测定环境空气和废气中环氧氯丙烷中，用活性炭采样管采样时，在采样管前不宜加接各种管道，以免环氧氯丙烷在管壁上被冷凝和吸附。