可与聚山梨酯类表面活性剂发生络合作用而减弱其防腐效力，需适当_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题 B1型题

可与聚山梨酯类表面活性剂发生络合作用而减弱其防腐效力，需适当增加用量的是（）

A.苯甲酸

B.苯甲酸钠

C.对羟基苯甲酸酯类

D.30%以上的甘油

E.20%以上的乙醇

答案

参考答案：C

单项选择题

蒸气所以能灭火是因为蒸气具有（）的作用。

A.隔绝空气

B.降低温度

C.稀释浓度

D.降低蒸发速度

完形填空

请阅读下面这篇文章，根据所提供的信息，完成信息卡，把答案写在答题卡指定的位置上。
Everyone should do something to protect the environment. How did we help to save our earth this week?
Mary: My family try to save electricity. We never left the lights on when leaving the rooms. We turn off the TV when nobody is watching it.
Tom: We start recycling this week. We divide our rubbish into different bags for bottles, cans, paper and food. Mom keeps the plastic shopping bags from the supermarket to use them again as rubbish bags. These are great ways to help our environment.
Jack: My family save water. We never take long baths and have short showers instead. We wash the toilet with used water. My sister and I don’t leave the tap running when we brushed our teeth.
Information Card

Ways to help protect the environment
Mary’s family	save electricity	Never left the lights on when leaving the rooms. 小题1: when nobody is watching TV.
Tom’s family	小题2:	小题3: into different bags for bottles, cans, paper and food.
Jack’s family	save water	Never take long baths. Wash the toilet小题4: . 小题5: when they brushed their teeth.