本试卷共8页，满分90分。考试用时100分钟。
一、 单项选择（共15题, 每小题1分，满分15分）
从A、B、C、D 四个选项中选出可以填入空白处的最佳正确选项。
1. Wu Dajing won gold in the men’s 500 meters, setting _____ world record at PyeongChang.
A. a B. an C. the D. /
2. Many people like posting photos of _____on WeChat, but I don’t think it’s safe.
A. them B. their C. they D. themselves
3. The Qingming Festival of this year falls _____ April 5th and thousands of cars poured into high-ways _____ the early morning of the holiday.
A. on; in B. in; on C. on; on D. in; in
4. I have a poor memory so I have to ______ my phone number book every time I want to make a call.
