正确答案: B

减少适量氯化钠固体

题目：（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________。

解析：B

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举一反三的答案和解析：

[单选题]ALight and shadow are friends． They usually go together． We receive light every day． At the same time，we produce shadow．

They are always together，when we get light，we can get shadow．

解析：21．D【解析】由文章最后一句可知光和影子是同时存在的。

[单选题]随着人口的快速增长，该城市可能出现的主要问题是

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．

until

解析：．11．c【解析】延续性动词与until搭配时，用于肯定句中，表示“到……为止”．

[单选题]6． Most people like Jazz 107．9 FM，because it _________ very beautiful music． ．A，gives

plays

[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.

p—It’s cold today. You’d better _________ your sweater.

put on B．turn on C．get on