根据成熟种子基本结构的差异种子可分（）和（）两种类型。根据幼

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问题填空题

根据成熟种子基本结构的差异种子可分（）和（）两种类型。根据幼苗形态上的差异，常见的幼苗可分为（）和（）两种类型。

答案

参考答案：有胚乳种子；无胚乳种子；子叶出土的幼苗；子叶留土的幼苗

句型转换

句型转换。

1. The boss asked Jenny, "Why are you always late for work?" (改为复合句)

The boss asked Jenny ______________________.

2. The clerk asked me, "Do you want to be a volunteer?" (合并为复合句)

The clerk asked me ______________________.

3. The reporter asked Yuan Longping, "How much money can you get from your research?" (改为复合句)

The reporter asked Yuan Longping ______________________.

4. Richard asked Julian, "When does your mother spend her holiday every summer?" (改为复合句)

Richard asked Julian ______________________.

5. I don't know how I can get to the hospital. (改为简单句)

I don't know ______________________.

单项选择题

肾脏调节酸碱平衡的机制中，错误的是

A．H⁺-Na⁺交换
B．HCO₃^-重吸收
C．分泌NH₃
D．分泌HCO₃^-
E．尿的酸化