若物价上涨，销售额持平，则销售量指数（）。 A.增长 B.降低 C.不变

课文填空。按照课文填出下列各句中缺少的词汇，每空一词。

A. In fifteen terrible seconds a large city lay in 1_____.

B. Although she didn't know the best way of getting to places, she insisted that she 2_____ the trip properly.

C. Geography also 3_____ a part in 4_____ dialects.

D. I can well remember that there was a time when a deep blue sky, the song of the birds, moonlights and

     flowers 5_____ never 6_____ 7_____ me spellbound.

E. He was 8_____ with his time, for which I was grateful.

F. He was the first man 9_____ land on the moon in July 1969.

G. A great person is someone who 10_____ his life to helping others.

金葡菌产生的致病物质不包括

A．溶血素

B．杀白细胞素

C．致热外毒素

D．剥脱性毒素

E．耐热核酸酶

They have the right to check ______ the will is valid(有效的), of course.

A．whether

B．why

C．when

D．how

某班同学用如图所示的装置测定空气里氧气的含量．药匙上放少量钠，烧杯中装满水，先用弹簧夹夹住橡胶管．点燃钠，伸入瓶中并塞上瓶塞．待钠熄灭并冷却后，打开弹簧夹，观察广口瓶内水面变化情况．

（1）写出燃烧匙中发生反应的化学方程式：______，将该生成物伸入瓶底的水中，生成的氧化产物与还原产物物质的量之比为：______．

（2）实验完毕，广口瓶内水面上升明显小于空气体积的1/5，对这一现象解释正确的是：______

a．该同学可能未塞紧瓶塞，导致钠熄灭时外界空气进入瓶内

b．该同学可能使用钠的量不足

c．该同学可能没夹紧弹簧夹，钠燃烧时部分空气受热从导管逸出

d．该同学可能插入燃烧匙太慢，塞紧瓶塞前瓶内部分空气受热逸出．

境内单位经常项目外汇账户的限额统一用欧元核定。