effect n．[C，U]结果，效果(力)；影响，作用
(1)cause and effect因果
be of no effect无效的；无用的
come/go into effect生效；实行
have an/some/little/no effect on对……有/有一些/几
乎没有/没有影响
take effect生效；起作用
in effect实际上；事实上
(2)effective adj.有效的；显著的，惹人注目的
例句
Scientists are studying the chemical's effect on the environment.
科学家正在研究该化学物质对环境的影响。
Any change in lifestyle will have an effect on your health.
生活方式的任何改变都将影响你的健康。
The new tax rates come into effect from April.
新的税率从四月起生效。
The new laws take effect from tomorrow.
新法令明日生效。
【练习】
It is said that your reading environment can have a great __________ your understanding，so give some thought ________ you can create or choose the right reading environment.
A．effects on；on how
B．effect on；on how
C．effects upon；to what
D．effect on；to what
【解析】 空一考查固定短语have an effect on“对……有影响”，故排除A、C两项；又根据句意可知是“如何创造或选择合适的阅读环境的一些想法”，故正确答案为B。
【答案】 B
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