“温度对面包上霉菌繁殖的影响”实验中，自变量是（）。
A.改变温度
B.霉变情况
C.面包发霉了
D.温度
参考答案：D
It is not rare in __________ that people in __________ fifties are going to university for further education.
A．90s; the
B．the 90s; 不填
C．90s; their
D．the 90s; their
（）是现代社会的基本要求。
