3. 解析:选D。考查动词词义辨析。句意为：在人类的帮助下，鸟儿们度过了一个极其寒冷的冬季，尽管它们自己没有储存足够的食物。suffer 遭受损失、伤害、损害或惩罚；live 生存；bear 忍受；survive 幸存，艰难渡过，符合句意。故答案为D。

2. 解析:选A。考查短语辨析。句中的被修饰词是parents, 四个选项中修饰可数名词的只有a great many。C、D两项修饰不可数名词；a lot不修饰名词，修饰名词时后需加of ,故答案为A。

5. The price of pork has gone up, but I doubt whether it will remain so.

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4. The American student gave me English lessons in exchange for Chinese lessons.

3. In the zoo, children are not allowed to approach those animals which look safe.

2. This/It is the third time I have told you not to bring your cellphone into the class.

5. have been discovered

B.1. such as　 2. for example　 3. for example　 4. such as

C.1. living　 2. lovely　 3. live 4.alive 5. lively