4．A　解析：段落大意题。根据最后一段的第一句“Bees also provide some clues to how we may build a more collaborative relationship with the services that ecosystems can provide.”可知，蜜蜂也提供了一些线索，关于我们如何与生态系统提供的服务建立一个更多的合作关系，因此本段主要讲述了与自然保持平衡是重要的。故A项正确。

　　B

　　(2015·陕西五校联考)Thanksgiving Day, a holiday designed to give thanks and blessings for a good harvest, is drawing near.But are you still having trouble with what gifts you should give? So let's take a look at some of the different gifts being sent to people from different countries, and maybe you will be able to find some inspiration.

　　Americans

　　In 1941, the United States Congress had passed a law, ruling the fourth Thursday of November to be Thanksgiving Day.The make­up parade (游行) is hard to miss, therefore cosmetics (化妆品)，such as cosmetic mirrors, skincare products and sunglasses, may be good choices for gifts.

　　Egyptians

　　In ancient Egypt, Harvest Festival was celebrated in honor of their harvest god Min during the spring season because that was when their harvest season would fall.The festival starts with a parade, followed by banquets, a ball and sports.Because music and movies are very popular here, CDs and DVDs are always great gifts.Moreover，art is also welcomed.One thing that should be noted is that blue and yellow colors need to be avoided since they are forbidden in the country.

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