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题目内容
（阿坝师范学院大学英语）
科学家们已经做了无数实验，表明在改进人的行为方面，表扬比批评有效的多。 [
A、 ] Scientists have done countless experiments to show that praise is far more effective than criticism in improve human behavior. [
B、 ] Scientists have done countless experiments to show that praise is far more effective than criticism in improving human behavior. [
C、 ] Scientists have done countless experiments to show that praise is far much effective than criticism in improving human behavior. [
D、 ] Scientists have done countless experiments to show that praise is far more effective than criticism to improving human behavior.
A、 ] Scientists have done countless experiments to show that praise is far more effective than criticism in improve human behavior. [
B、 ] Scientists have done countless experiments to show that praise is far more effective than criticism in improving human behavior. [
C、 ] Scientists have done countless experiments to show that praise is far much effective than criticism in improving human behavior. [
D、 ] Scientists have done countless experiments to show that praise is far more effective than criticism to improving human behavior.
参考答案