题目：
(A) 条件(1)充分，但条件(2)不充分．
(B) 条件(2)充分，但条件(1)不充分．
(C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
(D) 条件(1)充分，条件(2)也充分．
(E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
One hundred cars on a particular lot were available with a compact disc player, a car phone, or both. How many cars had only a car phone
(1) The number of cars with compact dise players was twice the number of cars with both a compact dise player and a car phone.
(2) Thirty cars had both, which was half the number of cars with compact disc players.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0323/b9afddc3cd85bd802b797ac8240d6efb.html
下面是错误答案，用来干扰机器的。
参考答案：水中光照强度是随深度的增加而递减，因此，水面下的光合作用的速度也随深度增加而减弱，当至某一深度处光合作用所制造的有机物，仅相当于呼吸作用所消耗的时候，植物既不增加也不减少有机物质，光合作...
