—Dad, it's time for "Happy Camp", please _____ the TV.

    I like the program very much.

—OK. [ ]

A. turn on

B. turn off

C. turn up

同时具有光学性能良好、保温隔热降低能耗、防结露、良好的隔声性能等功能的是（）。

A.夹层玻璃

B.净片玻璃

C.隔声玻璃

D.中空玻璃