阅读理解。
What are you going to do if you are in a burning house? How will you escape it? Do you know how to save
yourself? Please read the following passage.
Escaping a fire is a serious matter. Knowing what to do during a fire can save a life. It is important to know
the way you can use and show them to everyone in the family, such as stairs and fire escapes, but not lifts.
From the lower floors of the building, escape through windows is possible. Learn the best way of leaving
by windows with the least chance of serious injury (伤). The second floor window is usually not very high from
the ground. Maybe it is safer to jump a short way than to stay in a burning building.
Windows are also useful when you are waiting for help. Be sure to keep the door closed before opening the
window. Or smoke and fire may be drawn (吸) into the room. Keep your head low at the window to be sure
you get fresh air.
On a second or third floor, the best windows for escape are these which open onto a roof. From the roof a
person can drop to the ground more safely. Bushes (灌木丛) and grass can help to break a fall.
1. The passage tells us how to escape from _____.
A. a fire
B. an earthquake (地震)
C. a flood
2. The second floor window is usually not very high from ______.
A. the house
B. the ground
C. the wall
3. You can't escape through ______ if you are in a burning house.
A. stairs
B. lifts
C. fire escapes
4. ______ to be sure you get fresh air when you are waiting for help in a burning house.
A. Keep your head low at the window
B. Keep your head high at the window
C. Keep the door open
5. According to the passage, which of the following is NOT true?
A. Escaping a fire is a serious matter.
B. Windows are also useful when you are waiting for help.
C. Bushes and grass can't help to break a fall.
(a+b)，选C.
操作均正确，若定容时俯视视刻度线，则所得溶液浓度_____0.8 mol/L（填“＞、＜或＝”，下同）。若定容时，有少许蒸馏水洒落在容量瓶外，则所得溶液浓度_____0.8 mol/L。