Read and fill in the blanks. (根据句意，填写所缺词组)

1. I usually _____________________ (晨练) .

2. I often ___________________ (吃早饭) at home.

3. We ___________________ （上英语课）in the morning.

4. I _________________ (看望祖父母) with my parents on the weekend.

5. Sometimes I___________ (爬山) with my friends.

6. What's your father doing? He's ______________________ (接电话).

7. I like to_____________________ (观察昆虫) in the park.

8.1 always ______________________ (打扫房间) by myself.

9. Come and _______________________ (看一看) at the ants.

10. I'm going to ________________________ (写报告) this afternoon.

在一个无线局域网环境下，能用来保证有效资料安全的技术是哪一种（）。

A、消息鉴定码和无线变频收发仪

B、在不同的通道传输资料和消息鉴定码

C、在不同的通道传输资料和加密

D、加密和无线变频收发仪