The weather is _____ in July. [ ]
A. sun
B. suny
C. sunny
答案：C
Some pictures of the river brought the days back to the old they swam in it .
A．when
B．that
C．who
D．where
在相同条件下，A容器中的CH4与B容器中的NH3所含氢原子数相等，则两个容器的体积比是( )
A．4∶3
B．2∶3
C．3∶4
D．3∶2
