单项选择题
The scientists are（）a series of experiments to learn more about how the body adapts to weightlessness.
A.defining B.having C.carrying D.doing
单项选择题 The red flower goes from one to（）in the class.
单项选择题 The rain was（）make our picnic impossible.
单项选择题 The radio is too noisy, please（）.
