他桌上有什么东西。

　　②In the absence ________ any evidence，the police had to let him go.

　　由于缺乏任何证据，警方只得把他放了。

　　③That he was always absent ________ school made the teacher very angry.

　　他总是旷课，使得老师很生气。

　　【答案】　②of　③from

　　 surround vt.环绕；围绕

　　(教材P6)Some respected theories on language acquisition believe that to attain a high level of fluency and accuracy in a foreign language，you need to be surrounded by it.

　　一些备受尊崇的语言习得理论认为，要想达到高水平的外语流利程度和准确性，你得置身于该语言的环境中。

　　(1)surround sb./sth.with...　 使......包围某人/某物

　　be surrounded by/with... 被......包围/环绕

　　surround＋反身代词＋with... 喜欢结交(某类人)；喜欢身边总

　　 有(某类东西)

　　(2)surrounding adj. 周围的，附近的

　　surroundings n. 周围的事物；环境；气氛

　　①Some European countries are surrounded with/by dangers.一些欧洲国家现在危机四伏。

　　②________ (surround)by high mountains，the little village is hard to reach.

　　由于被高山所环抱，这个小村庄很难到达。

　　③Animals in zoos are not in their natural ________ (surround)．

　　动物园中的动物没有在它们的自然环境中。

　　【答案】　②Surrounded　③surroundings

　　 rely on依赖；依靠

(教材P6)Therefore，most of us have to rely on what we can learn at