题目内容

7.It is the test system,rather than the teachers,        is to blame for the students'heavy burden     nowadays.(  )
A.whoB.thisC.thatD.whom

分析 现在是考试制度而不是老师应为学生的沉重负担受到责备.

解答 答案是C.
考查强调句,分析结构可知此处是强调句型,被强调部分既有人也有物,被强调部分the test system rather than the teachers在句中做主语,所以用that,故答案选C.

点评 强调句是英语中的一个基本句型,也是考试的一个语法内容,在英文中,句子的主语、宾语、状语都可以以一种固定的句式表示对它的强调.It is/was+被强调部分+that+句子的剩余部分,掌握固定结构是做好强调句的关键.

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The Power of V
Birds of a feather may flock together,but why they fly together in V formations has never been known for certain.
Now,with the help of 14 northern bald ibises (欧洲秃鹰) equipped with(41)Dsensors on a 600-mile migration from Austria to Italy,researchers are suggesting that the explanation is one that was long (42)Cbut never proved:the formations helps the birds conserve energy.
Reporting in the (43)GNature,the scientists write that the ibises(44)Athemselves in spots that were aerodynamically optimal (空气动力学上最佳的)-allowing them to take advantage of swirls of upward-moving air(45)Fby the wings of the bird ahead.Since the lead bird got no lift advantage,the ibises regularly switched leaders.
"We've been wondering for years whether flapping birds can save energy by following each other in the right way,"said Geiffrey Spedding,a researcher at the University of Southern California,who was not involved in the study."This word answers that question,and the answer is yes."
The scientists,led by Jim Usherwood of the Royal Veterinary College in England,said a major (46)Ewas obtaining the data.The ibises hatched at Zoo Vienna in March 2011 and (47)Jas part of a conservation project aimed at reintroducing the (48)Kendangered species to its natural range in Europe.
Some of the study's authors served as human foster parents,taking the young birds on training flights in Salzburg,Austria.The humans rode in a paraplane,a type of lightweight aircraft,and the birds followed.Eventually,the foster parents taught the birds their 600-mile migration route from Salzburg to Orbetello,Italy,by flying alongside them.
The birds wore custom-made data loggers that allowed the researchers to track flapping,speed and direction.Weighing less than an ounce,the devices included a memory card and a GPS unit,among other things.It is(49)Ito about one foot and refreshes five times per second-the(50)Bnecessary to track the birds'positions in relation to one another.
The new study does not say how much energy the ibises saved through the V formation,but small gains could be useful over long migrations,experts say.

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