下列说法正确的是 [ ]
A．升高温度能使化学反应速率增大，主要原因是增加了反应物分子中活化分子的百分数
B．有气体参加的化学反应，若增大压强（即缩小反应容器的体积），可增加活化分子的百分数，从而使反应速率增大
C．增大反应物浓度，可增大单位体积内活化分子的百分数，从而使有效碰撞次数增大
D．催化剂不影响反应活化能但能增大单位体积内活化分子百分数，从而增大反应速率
A
| 用方框中所给单词的适当形式填空，使短文通顺、正确、连贯（每个单词限用一次）。 | |
Anna comes to England because she wants to study English. She helps Mrs Black 2. _____ housework in the house and goes to English 3. _____ every Wednesday and Friday afternoon. Anna is now in London. Everything is 4. _____ to her. She finds life is 5. _____ from that in Moscow. Some things are nice in London, many things are not so nice. The shops are 6. _____ in London than those in Moscow. 7. _____ it's very expensive to enjoy 8. _____ in London. It's expensive to have a 9. _____ at a restaurant or go to a cinema. Now Anna has got used to (习惯) many things, but she can't get used to the 10. _____ in England. "You English eat so much in the morning," she often says. "Fruits, porridge, eggs, tea and bread. How can you face (面对) all that food so early in the day?" |