填空题“before”改为“ago”

填空题“surprised”改为“surprising”

单项选择题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.

填空题“however”改为“moreover”

单项选择题A． shockB. horrorC. angerD. all of the above