【单选题】听力原文: The American Space Agency is continuing experiments that would make possible extended periods of space travel. One of these experiments is aimed at finding ways to grow food in space. Scientists...
A.
Scientists at the Kennedy Space Center are attempting to grow vegetables that could survive.
B.
In the special containers plants can develop rapidly in a short period of time.
C.
Scientists are also attempting to genetically design some of these plants to contain high levels of protein.
D.
Space agency scientists hope to test some version of the experimental gardens on the planned space station.
【单选题】There is no question that the old style. of air pollution could kill people. In one week following the infamous 'peasouper' fog in December 1952, 4, 700 people died in London. Most of these people wer...