问题：
—hat do you think of genetically modified food (转基因食品)?
—We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.
A．that, for
B．it, for
C．it, of
D．that, of
—hat do you think of genetically modified food (转基因食品)?
—We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.
—We all think ______ is careless ______ some scientists to say it is safe before doing any experiment.
| A．that, for | B．it, for | C．it, of | D．that, of |
参考答案：