A:2kqR2 ,方向沿半径向左
B:2kqR2 ,方向沿半径向右
C:3kqR2 ,方向沿半径向左
D:3kqR2 ,方向沿半径向右
⑴____ A. French B. second C. fever D. then
⑵____ A. he B. she C. tell D. fever
⑶____ A. yesterday B. present C. be D. penfriend
⑷____ A.seven B.relative C.me D. dress
⑸____ A. before B. behind C.festival D. because
____个平行四边形。