句型转换。

1. Jack likes dolphins because they're smart and interesting. (划线提问)

    _____ _____ Jack like dolphins?

2. Our school is near here in front of a big park. (划线提问)

    _____ _____ your school?

3. My pen pal is from Canada.(同意转换)

    My pen pal _____ _____ Canada.

4. They speak English and French. (划线提问)

    _____ _____ do they speak?

5. Jean likes dogs and cats best. (同意转换)

    Jean's _____ _____ are dogs and cats.

安全阀一般每年至少应校验一次，对于弹簧直接载荷式安全阀，经使用经验证明和检验单位确认可以延长校验周期的，使用单位向省级或其委托的地﹙市﹚级安全监察机构备案后，其校验周期可以延长。但最长不超过（）年。

A.2

B.3

C.4

D.5