根据句意，补全对话。

— What are the students ____?

— They are ____ for their parents.

      【甲】至于夏水襄陵，沿溯阻绝。或王命急宣，有时朝发白帝到江陵，其间千二百里，虽乘奔御风，不以疾也。春冬之时。则素湍绿潭，回清倒影。绝谳多生怪柏，悬泉瀑飞漱其间。清荣峻茂。良多趣味。每至睛初霜旦。林寒涧肃：常有高猿长啸。属引凄异，空谷传哀转久绝。故渔者歌日：“巴东三峡巫峡长，猿鸣三声泪沾裘。”                                                                                                                                  （选自《三峡》）

      【乙】水皆缥碧，千丈见底。游鱼细石，直视无碍。急湍甚箭，猛浪若奔夹岸高山，皆生寒树，负势竞上，互相轩邈，争高直指。千百成峰。泉水激石，泠泠作响；好乌相鸣，嘤嘤成韵。蝉则千转不穷，猿则百叫无绝。鸢飞戾天者，望峰息心；经纶世务者，窥谷忘反。横柯上蔽，在昼犹昏；疏条交映、有时见日。                                                                                                                                                          （节选自《与朱元思书》）

    More companies and recyclers are taking steps to ensure that old electronic devices such as TVs and computers aren't sent to poor countries.

    The Basel Action Network, a Seattle-based non-profit that largely exposed the overseas discarding (丢弃) of US electronic waste, on Thursday launched a programme to use third-party employees to certify (证实) recyclers who don't export dangerous electronic waste.

    The so-called e-Steward recyclers will also agree not to discard the waste in US landfills and agree to meet other criteria. The certification is intended to provide companies and consumers with some assurance that the waste, which can include toxins (毒素) such as lead and mercury, is disposed of safely.

    The Government Accountability Office, in a 2008 report, declared that US electronic waste was often disposed of unsafely in such countries as India. There, workers recycle gold, silver and copper from the waste, often in open-air acid baths.

    The Basel Network also says it won assurances from 13 organizations, including Samsung, Bank of America, Wells Far-go, that they'll use e-Steward recyclers whenever possible. Wells Fargo had already been using recyclers who declared not to export. So far, Basel has certified three recyclers and seven sites.

    Before e-stewards, even, companies that wanted to avoid export of electronic waste had to “hope for the best”, when, they handed their waste to recyclers, says Robert Houghton, president of Ohio-based recycler Redemtech. It is an e-Steward that counts major companies among its customers. “Now, they can get some proof,” Houghton says.

    Basel's standards compete with another set launched in January. It was made by industry and backed by the Environmental Protection Agency.

    That standard, called R-2, doesn't ban the export of dangerous electronic waste but requires that it be handled safely. Instead of a ban, the Institute of Scrap Recycling Industries says, efforts should be made to help poor countries develop safe recycling.