空玻璃瓶质量为50g，装满水后总质量为250g，则该瓶的容积是______ml，

写作。

      这是莉莉三、四月份的部分学校日历，请根据下列信息介绍一下她当时的学校活动。

至少6句话。

任务型阅读（共10分）

Tommy is a basketbal star. He needs to eat well every day. For breakfast, he eats an apple and two eggs. And he has chicken, vegetables and strawberries for lunch. For dinner, he likes hamburgers and salad. He eats ice cream for dessert(甜点) every evening.

Tommy is in Dream Basketball Club(俱乐部). He plays basketball every day and he plays it very well. He likes Yao Ming and he often(经常) watches his basketball games on TV.

阅读短文内容，回答下列问题。

小题1:Is Tommy a basketball star?

小题2:What does Tommy eat for lunch?

小题3:Does Tommy like eggs for dinner?

小题4:What club is Tommy in?

小题5:Does Tommy watch basketball game on TV?

光在真空中的传播速度为_______________ ，它比光在其他介质中的传播速度要 ________________。

对于急性胰腺炎的各项检查最早出现异常的是（）

A.血清脂肪酶

B.血清正铁血白蛋白

C.血清淀粉酶

D.尿淀粉酶

E.血清乳酸脱氢酶

二氧化硫的性质是什么？