单项选择题

A．six, more than 100
B．two, more than 200
C．two, more than 100
D．six, more than 200
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单项选择题
A．wheat, soybeans, carrot and lettuceB．soybeans, tomatoes, carrot and wheatC．white potatoes, carrot, lettuce and soybeansD．wheat, soybeans; lettuce and white potatoes
A．wheat, soybeans, carrot and lettuce
B．soybeans, tomatoes, carrot and wheat
C．white potatoes, carrot, lettuce and soybeans
D．wheat, soybeans; lettuce and white potatoes
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.
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.
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