41．A．on                B．until               C．before                D．by

40．A．animals            B．plants              C．countries              D．people

39．A．quickly            B．heavily             C．slowly                D．strongly

38．A．thousand           B．million            C．hundred              D．billion

37．A．fast                B．slowly              C．small                 D．big

36．A．From              B．On                 C．At                   D．Above

This is a diagram about the population of the world．  36    the diagram we know the population of the world grew quite   37    before 1800．But during the last two   38    years it has grown very   39   ．In 1800, the number of   40    in the word was nine hundred million．But   41    October 12^th , 1999, the population had   42    six billion．Today, it is still   43    faster than ever before．New research shows that more than 2.6   44    will be born in one   45    in the world．As it goes on, the population of the world   46    seven billion by the year 2010．That   47    we must grow much more food to   48    all the people．Do you know what will   49    in six hundred years? Yes, by then we will have only    50    room on earth．

34．He didn't sent the e-mail ________ he connected his computer to the phone line．

A．till               B．after               C．as soon as             D．while