（2015•济南）如图，抛物线y=﹣2x²+8x﹣6与x轴交于点A、B，把抛物线在x轴及其上方的部分记作C₁，将C₁向右平移得C₂，C₂与x轴交于点B，D．若直线y=x+m与C₁、C₂共有3个不同的交点，则m的取值范围是（　　）

下列句子中划线词语使用不恰当的一项是（    ）

用所给单词的适当形式填空，未提供单词的根据上下文填入适当的词。Mary's secret

Mary got home very late these few months. Her parents were very  ____ (worry). But when they asked

Ker about that, Mary always had different  ____ (excuse). Her father wanted to find out ____ happened to her.

One day after school, Mary's father secretly followed her to a park. Mary sat down ____. began to paint a picture alone. Her father, stood far away and watched her ____ (paint).

“This little girl comes here to paint every day. I think she  ____ (love) painting,” the cleaner there told him. Her father felt sorry, because he had never wanted ____ (understand) what his daughter liked. He and his wife thought painting was____ waste of time and never supported her. They thought Mary should focus more  ____ her studies, especially science. They only wanted to make her a doctor or an engineer. Now he realized what Mary liked

____ (much) of all her subjects. Her father was moved and changed his mind.

已知实数a、b满足（a²﹣b²）²﹣2（a²﹣b²）=8，则a²﹣b²的值为（　　）

    As a saying goes, he who doesn't reach the Great Wall is not a true man. The Great Wall in China ____(impress) everyone who sees for the first time ____ the general tourists to scholars. The vastness of the structure helps children grasp the great ____(achieve) in human history and can help inspire them ____ (learn) more about human success over one thousand years.____ (construct) over a period of 2,000 years, the stone solider ____(actual) consists of many great walls, some of____date back to the fifth century B.C. The first emperor of China, Qin Shi Huang,____ (order) these earlier long wall sections linked and extended with watchtowers to protect the new empire from northern tribes. Succeeding emperors and dynasties continued the construction.____ (spread) westward into the Gobi desert to guard____Silk Road. All together, the walls may have stretched more than 30,000 miles.