呼吸作用的原料是（） A．二氧化碳和水 B．有机物和氧气

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问题选择题

呼吸作用的原料是（　　）

A．二氧化碳和水

B．有机物和氧气

C．水和氧气

D．水

答案

呼吸作用是细胞利用氧把有机物分解成二氧化碳和水，并且把储存的有机物里面的能量释放出来．呼吸作用的原料是有机物和氧气，产物是二氧化碳和水．

故选B

填空题

语法填空。

At 3:42 a.m. everything began to shake. It seemed l_____ the world was 2_____ an end! Eleven kilometers

3_____ (direct) below the city the greatest earthquakes of the 20th century began. It was heard in Beijing,

4_____ is one hundred kilometers away. One-third of the nation felt it. A huge crack that was eight kilometers

long and thirty meters wide cut 5_____ houses, roads and canals. Steam burst from 6_____ (hole) in the

ground. Hard hills of rock became nvers of dirt. In fifteen terrible seconds a large city lay in ruins. Two-thirds

of the people died or 7_____ (injure) during the earthquake. Thousands of families 8_____ (kill) and many

children were left 9_____ parents. The number of people 10_____ were killed or injured reached more than

400,000.

单项选择题

柯萨奇病毒引起的疱疹性咽峡炎多发于（）

A.冬春季

B.春秋季

C.夏秋季

D.春季

E.秋冬季