Carbon dioxide(CO2)_______ from burning fuels is the most common of the so-called greenhouse gases.
| A．producing | B．having been produced |
| C．to be produced | D．produced |
相关试题
Scientists have shown that there is a connection ____ cigarette smoking and certain diseases.
| A．with | B．between | C．to | D．on |
Most of the universities in China provided scholarships for students ______ financial aid. 
| A．in favor of | B．in honor of | C．in face of | D．in need of |
In the experiment the scientist kept a watchful eye________the developments and recorded every detail.
| A．in | B．at | C．for | D．on |
He has some trouble ______ his classmates, but he has no trouble ______ doing his lessons.
| A．with; with | B．in; in | C．with; in | D．in; with |
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