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It is important to ______ until the plants begin to grow.

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You should spend about 40 minutes on this topic.
Write about the following topic:
With the increasing use and development of new technology, many machines are now able to do the work which people used to perform.
What are the advantages and disadvantages of this trend？
Give reasons for your answer and include any relevant examples from your own experience.
Write at least 250 words.

In ancient times, Olympic games were held as a religious festival to honor the Greek gods.

在气相色谱分析中，影响组分分离度的主要因素是和_。

极谱分析中产生极限扩散电流的条件是_________。