题干
The 31st Olympic Games will take place in Brazil ______ 2016.
A：at
B：on
C：in
D：by
答案(点此获取答案解析）
C
The 31st Olympic Games will take place in Brazil ______ 2016.
A：at
B：on
C：in
D：by
的植株上授以纯合光桃的花粉，该雌蕊发育成的果实应为（ ）