阅读理解，选择正确答案。

      I am Jack. I live near our school. So I can go to school on foot. But sometimes I go by bike. Because it's

so much fun. My father works in our school. We go to school together. On the weekends, I often play with

my friend, Mike. We usually play ping-pong, sometimes we play chess. This weekend, I'm going to visit my

grandparents. Because it's my grandma's birthday.

1. Jack usually goes to school _____________.

A. on foot

B. by bike 

2. Jack's mother lives _____________.

A. in the school

B. near the school

3. Jack goes to school with _____________.

A. his father

B. his friend, Mike

4. Jack and Mike usually _____________.

A. play chess

B. play ping-pong

5. Whose birthday is this weekend?

A. Grandfather's

B. Grandmother's

船舶在A1海区遇险使用DSC报警，频率应为：（）

A.VHF/CH16

B.VHF/CH13

C.VHF/CH6

D.VHF/CH70