:一、单选题（本大题共15小题，共15分）
1. As _______ monitor of our class，Jason has _______ great responsibility to get the class to work together as a team..
A. a； the B. 不填； a C. a； 不填 D. a； a
2. The new playground to be built next year will be_____the old one．
A. as three times big as B. three times as big as
C. as big as three times D. as big three times as
3. We can observe that artificial intelligence has already made a（n） ________on our lives in many ways．
A. statement B. impact C. impression D. judgment
4. She often ________ her daughter on the way home after work.
A. joins up B. looks up C. picks up D. takes up
5. Television is more than an electronic equipment; it _____ a powerful tool for communication.
A. was becoming B. has become C. had become D. will become
6. Lets not pick these peaches until this weekend__________they get sweet enough to be eaten．
A. ever since B. as if C. even though D. so that
