本句是介词短语in hope of doing sth. 希望……。

　　3. The 21 -year-old Best hopes his message-that this is a new time in agriculture-will motivate the next generation to turn around the statistics.

　　本句是his message 的同位语从句

　　4. Never before have we had the innovations ( 创新) in technology which have led to agriculture in this country being the most efficient it has ever been,”

　　本句never 否定词放在句首，后面用部分倒装，the innovations的定语从句，which是关系代词。

　　6.【2017天津卷】

　　C

　　The practice of students endlessly copying letters and sentences from a blackboard is a thing of the past. With the coming of new technologies like computers and smartphone, writing by hand has become something of nostalgic (怀旧的)skill. However, while today’s educators are using more and more technology in their teaching, many believe basic handwriting skills are still necessary for students to be successful---both in school and in life.

　　Virginia Berninger, professor of educational psychology at the University of Washington, says it’s important to continue teaching handwriting and help children acquire the skill of writing by hand.

　　Berninger and her colleagues conducted a study that looked at the ability of students to complete various writing tasks---both on a computer and by hand. The study, published in 2009, found that when writing with a pen and paper, participants wrote longer essays and more complete sentences and had a faster word production rate.

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