单项选择题

What caused the deposits

A．The hydrochloric acid broke the carbon bonds in tile carbon dioxide,
B．The magnesium oxide broke the carbon oxygen bonds in the carbon dioxide.
C．The burning magnesium broke the carbon oxygen bonds in the carbon dioxide.
D．The gas collection method broke the carbon-oxygen bonds in the carbon dioxid

<上一题目录下一题>

热门试题

单项选择题

The minister was the person （）.

A．in whose honor the state dinner was given
B．whom the state dinner was given in honor
C．for him the state dinner was given honor
D．whose honor the state dinner was given

问答题

Listen to the following passage. Altogether the passage will be read to you four times. During the first reading, which will be read at normal speed, listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 seconds. The last reading will be read at normal speed again and during this time you should check your work. You will then be given 2 minutes to check through your work once more.