For i, they may grow corn or wheat in a field one year, and then grow beans there the next.

1. For i, they may grow corn or wheat in a field one year, and then grow beans there the next.

【考点】

固定短语; 不可数名词;

【答案】

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单词拼写（单句）普通

1. different crops are grown is because they put important minerals back into the ground, (make) it ready for the next batch of crops.

语法填空（单句）普通

2. What keeps them doing so is the fact chemical farming serves the high demand food around the world.

语法填空（单句）普通

3. 人们担心地是，智能手机被广泛地使用，很多孩子沉迷于其中。

句子翻译困难