I、单项选择（20分）
1. She exercises once _____twice a week, but she watches TV at least two _____six times a week.
A. or, or B. or, to C. to, to D. to, or
2. I don’t want to go to the museum, it’s too_______.
A. relaxing B. boring C. bored D. beautiful
3. I didn’t go to the mountains ______the bad weather.
A. so B. because of C. because D. But
4. Although he is very old, ______ he works very hard.
A. so B. but C. and D. /
