题目内容

What campaign did Tsinghua University launch last year?Tsinghua University launched a campaign to ___________________________without their parents' help.

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What response did Tsinghua' s call receive from students and other universities?The call received_________response from both students and other universities.

What is the purpose of encouraging freshmen to enroll by themselves?_________________________________ and improve their social skills.

食品生产企业，人流、水流和气流的方向是（）

A. 高密度区到低密度区
B. 高气流区到低气流区
C. 高污染区到低污染区
D. 高清洁区到低清洁区

以下哪项材料不属于避免食品接触材料（）

A. 竹木材料
B. 料
C. 铁材料
D. 铜