问题
选择题
植物根毛细胞吸收矿质元素的主要方式是[ ]
A．渗透作用
B．自由扩散
C．主动运输
D．协助扩散
答案
答案：C
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植物根毛细胞吸收矿质元素的主要方式是[ ]
A．渗透作用
B．自由扩散
C．主动运输
D．协助扩散
答案：C
| 选择合适的单词写在句子中的横线上。 | |
2. Our lessons _____ at nine o'clock in the morning. 3. We have a break and talk _____ friends. 4. _____ half past seven in the morning, we have breakfast. 5. We have two maths lessons _____ Tuesday. 6. Daming and Lingling have hamburgers, _____ vegetables or rice. 7. Games start at eight and _____ at ten.  8. I love table tennis, I like to _____ table tennis with my friends on Saturday morning. |