问题
选择题
下列实验操作中，错误的是（ ）
A．实验室制取二氧化碳时，先检查装置的气密性
B．稀释浓硫酸时，在量筒中加入适量浓硫酸，再缓缓加入水
C．洒在桌面上的酒精燃烧起来，立即用湿抹布盖灭
D．在做点燃氢气的实验时，先检验氢气的纯度
答案
答案：B
搜题请搜索小程序“爱下问搜题”
下列实验操作中，错误的是（ ）
A．实验室制取二氧化碳时，先检查装置的气密性
B．稀释浓硫酸时，在量筒中加入适量浓硫酸，再缓缓加入水
C．洒在桌面上的酒精燃烧起来，立即用湿抹布盖灭
D．在做点燃氢气的实验时，先检验氢气的纯度
答案：B
The Town Zoo Zoo rules 1. Stay behind the yellow line. 2. Do not feed the animals. 3. Do not put your fingers through the fences(栅栏). 4. Do not bring balloons into the zoo. 5. Do not play ball games or ride bicycles in the zoo. 6. Do not shout or clap your hands. This may frighten the animals. 7. Keep the zoo clean. Eat only in the eating areas. Tip for visitors Some animals take a midday nap(小睡). If you cannot see them, come back later. Entrance fee
Monday to Friday 9：00 a.m.～4：00p.m. Saturday and Sunday 10：00 a.m.～5：00 pm 小题1:If visitors can not see the animals, the animals may be______.
小题2:Jack is eight years old. He goes to the zoo with his 58-year-old grandfather．How much should they pay for visiting the zoo?
小题3: What should we do in order not to frighten the animals?
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