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[音频]2. People often feel fights are normal in marriage and family relationships but difficult to accept in friendship. This can cause friends to _ too fast on their relationship when trouble _.

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[音频]3. Studies show that having a friend _ can reduce worry during a difficult experience. “Our bodies _that they don’t have to respond so much to danger if someone is there to help,” says a researcher in psychology.

气缸、气缸体和气缸盖常见的损伤形式有（）。

A. 裂纹
B. 变形
C. 磨损
D. 断裂

气缸盖裂纹产生的原因有（）。

A. 设计、制造中的缺陷
B. 冷却水中未添加防冻液
C. 高温下突加冷水或低温下突加热水
D. 安装不当
E. 气缸套过盈量太大

气缸体和气缸盖裂纹的检验方法有试验法和试验法。