19．A.important

　　B．hard

　　C．realistic

　　D．friendly

　　解析：选A　本句是作者猜测的内容，作者认为一定是有人发现了那个信封，意识到这封求职信对其主人来说一定很重要，所以代为投递了。故选A。

　　20．A.imagined

　　B．responsible

　　C．hidden

　　D．unknown

　　解析：选D　由上下文语境知，拾到自己丢失信封的那位好心人作者并不认识。故选D。

　　Ⅳ.阅读理解

　　(2017·马鞍山高三两校联考)A Vietnamese man hopes to raise the quality of education in his country by building “parent libraries” in rural schools.

　　Nguyen Quang Thach provides libraries to the schools so books are more available in farming communities. He works with publishers in Hanoi to get the books at reduced rates for teachers and their students.

　　Mr. Thach says most schools have enough textbooks.

　　But he says many poor families have few books at home and do not visit school libraries. He learned this by talking with farmers, workers and students.

　　More than 90 percent of Vietnam's population can read and write. But academic performance in the schools remains low compared to other Southeast Asian nations. Corruption is a big part of the problem. Vietnamese media often have stories about teachers giving high grades in exchange for money.

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