在如图所示的食物网中，要使E的产量最高，把能量集中引向E的食物链应是(     )

地球上的生命是息息相关的，我们要关爱地球上的生命，保护人类赖以生存的生态环境。下面行为中正确的是（  ）
①小林用自来水清洗鸟的伤口并小心的用红领巾包扎好   ②某班全体同学参加了今年植树节活动
③李明把小朋友捉到的青蛙放回田里                                   ④小东每到周末都会到山上打鸟

根据短文理解，从A、B、C、D四个选项中选择最佳答案。

    Almost everyone knows about Olympic Games. But not 1 people know how they started, why they once stopped and when the People's Republic of China took part in the Olympics.

    People 2 the first Olympic Games in Greece (希 腊）in 776 B. C. They had the Olympics 3 four years in summer. The first Olympics 4 for only one day and there was only one contest (比赛).It was a short race. Only Greek men could 5 in the race. Women couldn't 6 the race.

    When Rome (罗马）ruled Greece, the Olympics 7.

    The People's Republic of China took part in the Olympics 8 the first time in 1952. 9 China got no gold medals until (直到）1984 in the Los Angeles Olympics. China won the first 10 in the 29th Beijing Olympics in 2008. We hope China will get more gold medals in the 30th Olympics in London. Come on, the Chinese players!

现有小麦种质资源包括：①高产、感病；②低产、抗病；③高产、晚熟等品种．为满足不同地区及不同环境条件下的栽培需求，育种专家要培育3类品种：a．高产、抗病；b．高产、早熟；c．高产、抗旱．下述育种方法可行的是（　　）

（1）利用①、③品种间杂交筛选获得a；

（2）对品种③进行染色体加倍处理筛选获得b；

（3）a、b和c的培育均可采用诱变育种方法；

（4）用转基因技术将外源抗旱基因导入③中获得c．