2. Read and choose The children are playing a guessing game.
Binbin: It has lots of roots under the ground.
Amy: Is it a tree?
Binbin: No, it isn't. It doesn't have big leaves like other plants.
Mike: How about its stem? Does have a big stem?
Binbin: Yes, it's big and thick. It helps store(储存) water and catch sunlight.
Mike: I got it! It's the .

A sago cycas
B cactus

B

提取对话关键信息：①该植物没有其他植物那样的大叶片；②它的茎又大又厚，可以储存水分。对比选项：A的苏铁长有大片羽状叶片，不符合条件；B的仙人掌没有普通植物的大叶片，厚实的肉质茎可储水，完全符合所有描述。

3. Read and write
A sweet potato doesn't grow from .
How does it grow?

First, cut the sweet potato into pieces and plant them.
Then a with leaves grows from the piece.
Next, the leaves grow big. We can pick them to eat.
Finally, the under the ground get big and become new sweet potatoes.

1. seeds
2. sprout
3. roots

本题结合红薯的生长过程，考察五年级阶段学习的植物相关英语词汇，结合配图和植物生长常识补全空缺：
1. 红薯采用切块的方式无性繁殖，并非从种子生长而来，第一空填表示“种子”的复数名词seeds；
2. 种下红薯块之后，会从切块上长出带叶片的嫩芽，对应配图的小幼苗，第二空填sprout；
3. 最后地下的根系不断长大，最终长成新的红薯，句中谓语动词get为复数形式，第三空填复数名词roots。