题目

Swimmers WantedCan you swim? Do you like kids? Can you help them with swimming on weekends?Come and join us. Call Mr. Clark at 530－6342.Chess ClubDo you like to play chess? Do you want to play chess well? Mr.Scott can teach you. You can come here every Sunday evening.Tel：828－4940 Add：Room 102 in School BuildingLet's Learn French(法语)Can you speak French? Do you want to learn French? Join the French club now. Time：8：00 a. m.～11：00 a. m. from Monday to Friday. Call Peter at 569－5348.Musicians WantedBoys and girls, are you music lovers? Can you sing or dance? Can you play the（3分）一个玻璃瓶内原有盐水，盐的重量是水的，加入15克盐后，盐的重量占盐水总量的，瓶内原有盐水（ ）克． A.480 B.360 C.300 D.440