B
Below is a table which shows the melting(液化)and boiling points of common substances.Study the table.Then do Numbers 4—7.
|
Substance |
Melting point(C) |
Boiling Point(C) |
|
Water Alcohol Nitrogen Oxygen |
0 –117 –210 -218 |
100 78 –196 –183 |
4.The underlined word‘substances'means‘a type of'_________.
A.matter B.liquid C.solid D.gas
5.Which of the four should be a liquid at-90 degrees?
A.water B.alcohol C.nitrogen D.oxygen
6.Mixing alcohol and water is often used to wash windscreens of cars during the wintertime because _________.
A.it is easier for alcohol to change into gas
B.alcohol is not easily separated from water
C.alcohol freezes at lower temperature than water
D.the mixture is not expensive
7.In order to change water from a solid to a liquid energy must be _________.
A.removed B.added C.created D.destroyed
—__________ Mr.White was appointed director of our department.
—Then we have two Whites now including ___________ Mr.White, the doorkeeper.
|
A.The; a |
B.A; the |
C.A; 不填 |
D.不填; a |
—What’s that? It smells great!
—It’s just milk tea.Would you like __________?[来源:]
|
A.this |
B.one |
C.it |
D.some |
I would appreciate very much if you could send me a few copies of the mechanic design of your new model.
|
A.it |
B.that |
C.this |
D.you |
The party was meant to be a surprise to everyone who would take part, but one of the organizers _______ the plan.
|
A.gave away |
B.gave out |
C.gave up |
D.gave back |
With the environment worsening, the government ______ people for more environment protection.
|
A.reacts to |
B.appeals to |
C.refers to |
D.leads to |
I don’t think it easy, even if we work hard, the South Korea and the North Korea to sit down to talk at present.
|
A.persuaded |
B.persuade |
C.to persuade |
D.persuading |