Based on differences in sizes of bison across herds, Craine found that during the next 50 years, future generations of bison will be smaller in size and weigh less. Climate is likely to reduce the nutritional quality of grasses, causing the animals to grow more slowly.

　　“We know that temperatures are going to go up,” Craine said. “We also know that warmer grasslands have grasses with less protein（蛋白质）, and we now know that warmer grasslands have smaller grazers. It all lines up to suggest that climate change will cause grasses to have less protein and cause grazers to gain less weight in the future.”

　　Craine said the results of climate change in coming decades can already be seen by comparing bison in cooler, wetter places with those in warmer, drier places. For example, the average 7-year-old male bison in South Dakota weighed 1, 900 pounds, while an average 7- year-old male bison in Oklahoma — a warmer place — weighed 1, 300 pounds.

　　“The difference in temperature between those two states is around 20 degrees Fahrenheit, which is about three times the projected increase in temperatures over the next 75 years,” Craine said. “It is a clear indicator that long-term warming will affect bison and is something that will happen across the U.S. over the next 50-75 years.”

　　1..In the next fifty years, researchers Say, bison will ________.

　　A. become smaller and lighter

【2016届湖北武汉市高考英语阅读理解二轮基础训练（48）（含答案）】相关文章：

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之记叙文：解题技巧（含解析）

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习书面表达专题训练：Ⅱ卷强化增分练 训练3（含解析）

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (48)

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（20）及答案

★ 重庆市2014高考英语阅读理解一轮（精品）训练题（6）附答案

★ 盘点2016年高考英语二轮复习最笨最好的方法

★ 湖南省岳阳市2014高考英语一轮单项选择训练题（17）及答案

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (55)

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习短文改错专题训练：训练4 短文改错（Ⅳ）（含解析）

★ 2017届高考英语二轮复习大题冲关秘籍短文改错：名校模拟（含解析）