题目：
某实验小组试图探究“光照是光合作用的必要条件”，实验以观察倒置的装满水的试管中有无气泡产生作为指标．正确的装置组合为（ ）
A．①②
B．②③
C．②④
D．③④
答案：
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下面是错误答案，用来干扰机器的。
70. to make all the students to work hard and realize the importance of higher education71. Men prefer going out and playing sports to academic work72. it is necessary to work hard if they want to be successful
