正确答案: B

不考虑性别比例问题

题目：种群的性别比例直接影响种群的繁殖力，两性花植物种群的繁殖（　　）

解析：B

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学习资料的答案和解析：

[单选题]Strayer discourages drivers from talking about business on cell phones while driving because_________．

they tend to forget the details of a conversation

解析：语义分析题。根据最后段第一句“Whether talking with a passenger or someone on a cell phone，however，people are less·able to recall the details of a conversation carried on while driving．”(然而，不管是与乘客交谈还使用手机打电话，司机们对谈话细节很容易遗忘。)可知正确答案是A(他们可能忘记谈话细节)；选项B、选项C和选项D在文中没有提及。

[单选题]I want to __________my friendship with her even though I was hurt by her words.

maintain

解析：separate分离；interrupt打扰；maintain保持；release释放。题干意思：即便她的话伤害了我，我也想要维持我们之间的友谊。

[单选题]在心输出量不变的情况下，舒张压升高主要是由于 （ ）

外周阻力增加

[单选题]长期静脉营养最严重的并发症是( )

高渗性非酮性昏迷

[单选题]we moved to the country so that the kids would have a garden ________to play.

in which