We find that bright children are rarely held back by mixed-ability teaching. On the contrary, both their knowledge and experience are enriched．We feel that there are many disadvantages in streaming pupils．It does not take into account the fact that children develop at different rates．It can have a bad effect on both the bright and the not-SO·bright child．After all，it can be quite discouraging to be at the bottom of the top grade!
By "held back" (1ine 1)the author means
A made to remain in the same class
B forced to study in the lower class
C drawn to their studies
D prevented from advancing
本題考的是對詞組hold back的理解。根據(jù)上下文，它的意思是"阻擋，阻礙"，選項D是正確答案。當(dāng)然hold back還可以表示(1)"猶豫"，如I have noticed that you do not hold back in our discussion．(我發(fā)覺你在討論時并不猶豫。)(2)"控制"，如The dam was not strong enough to hold back the flood waters．(大壩不夠堅固，擋不住洪水。)(3)"保留，不公布"，如I think he's holding something back：He knows more than he admits．(我認(rèn)為他還隱瞞了一些事情，他知道的比他承認(rèn)的多。)對照上下文，選項A、B、C都不能表達(dá)hold back的意義。