1. [单选题]10.________exciting news! We will have__________- long holiday after the exam.
A. What an ;a
B. What ;a
C. How an ;the
D. How ;the
2. [单选题]Jim is very interested in sports . He can take part in sports activities every ______ .
A. Monday
B. Wednesday
C. Thursday
D. Friday
3. [单选题]下列关于空气的说法中,错误的是
A. 工业上利用氧气和氮气的沸点不同,从液态空气(liquid air)中分离出氧气的过程属于物理变化(physical change)
B. 空气是一种十分重要的天然资源(natural resources)
C. 若大量有害物质进入空气中,仅靠大自然的自净能力,大气还能保持洁净
D. 按体积分数计,空气中约含有氮气78%、氧气21%、其他气体和杂质1%