【名词&注释】
经济发展(economic development)、人口老龄化(population aging)、城市用地(urban land)、氯化钠(sodium chloride)、快速增长(rapid growth)、延续性动词(durative verbs)
[单选题]（2）用托盘天平称量所需的氯化钠时，发现托盘天平的指针偏向左盘，应____42________。
A. 增加适量氯化钠固体
B. 减少适量氯化钠固体
C. 调节平衡螺母
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举一反三：
[单选题]ALight and shadow are friends． They usually go together． We receive light every day． At the same time，we produce shadow．
A. Your body stops it from passing． There is 'a dark spot on the ground next to you． The light cannot reach the dark spot． This is your shadow．
B. Your body stops very little light from reaching the ground． So your shadow is quite short．
C. Its light moves over more of your body．Then your shadow is quite long． Your body keeps a lot of light from reaching the ground．
D. Without sunlight，life on the earth is impossible．Most of us like to stand in the shadow of a tree in summer． But some people are afraid of their own shadow at night． They do not want to walk in a dark street． They do not want to see the shad-ow，either． But still light and shadow usually go together．
E. The sentence "Light and shadow are friends． " means ________ ．
F. the shadow produce light
G. the light usually follows the shadow
H. they usually get on well with each other
I. They are always together，when we get light，we can get shadow．
[单选题]随着人口的快速增长(rapid growth)，该城市可能出现的主要问题是
A. 人口老龄化突出
B. 城市经济发展变慢
C. 社会劳动力不足
D. 城市用地压力增大
[单选题]In the USA children start school when they are five years old． In some states they must stay in school (11) they are sixteen． Most students are seventeen or eighteen years old when they (12) school． There are two kinds of schools in the United States: public schools and pri-cate(私立)schools．(13)children go to public schools． Their parents do not have to(14)their education because the schools (15) money from the government． If a child goes to a private school，his parents have to get enough money for his schooling ． Some parents still (16) private schools，though they are much more expensive．
A. A student at a state university does not have to pay very much if his parents (18 in that state． But many students(19) while they are studying at universities．In this way they (20)good working habits and live by their own hands．
C. and
D. though
E. until
F. since
[单选题]6． Most people like Jazz 107．9 FM，because it _________ very beautiful music． ．A，gives
A. takes
B. plays
C. brings
[多选题]—It’s cold today. You’d better _________ your sweater. 学科网 —OK. I will.学科网
—It’s cold today. You’d better _________ your sweater.
—OK. I will.
A. p—It’s cold today. You’d better _________ your sweater.
B. put on B．turn on C．get on
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