Directions:For this part, you are supposed to write an essay in about 100-120 words based on the following situation. Remember to write it clearly.

61．新學(xué)期伊始，你（Li Yuan）有意加入學(xué)校環(huán)保社團（Environmental Club）。請給該社團寫一封申請信，內(nèi)容包括：

·個人情況介紹；

·申請加入的原因；

·你期望在社團中承擔(dān)的工作；

·你對社團發(fā)展的建議。

23（ ）

• A、dangerous

• B、happy

• C、lonely

• D、colourful

Which of the following helps to determine our sleep cycles?

• A、Circadian rhythms.

• B、The environment.

• C、Blood pressur

• D、Heart rat