4.This is because the Impressionists encouraged artists to look at their environment in new ways.

这是因为印象派鼓励画家用崭新的方式去看待他们的环境。 This/That is

because ...意为"这是/那是因为......"；because在句中引导表语从句。 He wants to find another job; this_is_because he can't put up with the pressure here any more.

他想另找一份工作，这是因为他再也无法忍受这儿的压力了。 　　

　　1．(教材P1)Art is influenced by the customs andfaithof a people.

　　艺术受一个民族的风俗和信仰的影响。

　　faith n.信任；信心；信念

　　(1)have (one's) faith in　　 相信......；对......有信心

　　lose faith (in) (对......)失去了信心

　　(2)faithful adj. 忠实的

　　faithfully adv. 忠实地

　　①I have faith in you; I am sure you will do well.

　　我相信你，我确定你会做好的。

　　②What I want to know is whether or not you have lost_faith_in it.

　　我想知道的是你对这件事是否失去了信心。

　　③One cannot be too faithful (faith) to one's duty.

　　对自己的职责无论怎样忠诚也不过分。

　　2．(教材P2)During the Middle Ages, the main aimof painters was to represent religious themes.

　　在中世纪，画家的主要目的是表现宗教主题。

　　aim

　　(1)n.[C]目的；目标

　　without aim＝aimlessly　　 漫无目标

　　with the aim of 以......为目标；意在......

take aim at 向......瞄准