It is pretty well understood_______controls the flow of carbon dioxide in and out of the atmosphere today．
| A．that | B．when | C．what | D．which |
Today acupuncture, the art of “magic needles”, has become popular round the world, ______ have other traditional Chinese medicines.
| A．so | B．as | C．that | D．which |
Penicillin became the greatest drug of the 20th century, without ______ many people ______ from sickness or even small wounds.
| A．it, died | B．which, have died |
| C．which, would have died | D．it, would have died |
Hot water is converted to electricity by a turbine. The underlined word can be replaced by ______.
A. conveyed B controlled. C. chosen D. Changed
The noise coming from upstairs are driving me mad.
| A．cognitive | B．excessive |
| C．irritating | D．Exposing |
We should take effective measures to the infectious disease.
| A．work out | B．stamp out | C．turn out | D．carry out |