proud of the country's history of welcoming people from around the world and of the diverse population.

　　语篇解读：本文是说明文。2017年7月1日是加拿大建国150周年纪念日。本文介绍了相关内容和加拿大的相关知识。

　　4．What do we know about the celebration of Canada Day in 2017?

　　A．It was bigger than that of Independence Day.

　　B．Over a million foreign people attended it.

　　C．Many different activities were held.

　　D．It was celebrated on July 4.

　　解析：选C　细节理解题。由第一段可知，2017年7月1日是加拿大的国庆日，它已经建国150周年了。国庆日当天举行了各种各样的庆祝活动，如烟花、晚会、表演等。

　　5．What does Paragraph 2 mainly talk about?

　　A．How Canada came as a nation.

　　B．Why explorers lived in Canada.

　　C．The people who controlled Canada.

　　D．The official languages of Canada.

　　解析：选A　段落大意题。由第二段的内容可知，该段主要讲的是加拿大的历史：由原来的蛮荒之地、殖民入侵到最后的独立。

　　6．What makes the sports in Canada so different?

　　A．Canada's cultural background.

　　B．Canada's geographic location.

　　C．Canada's diverse population.

　　D．Canada's special weather.

　　解析：选B　细节理解题。由最后一段可知，加拿大靠近北极，很多地方经常被冰雪覆盖，这产生许多极富地理特色的运动，如冰上曲棍球、滑冰、冰壶等。

　　C

　　Researchers in Seattle said last year that captured (被捕获的) crows remember the face of their abductor (绑架者). Even though years had passed since they saw the threatening face, the crows in the experiment would divebomb him, suggesting the birds held tightly to a negative association.

Now the researchers' follow­up study shows that the birds' brains light up much like the human mind when they see a face they know.