甲、乙两图分别表示一简谐横波在传播方向上相距3.0m的两质点的振动图象，如果波长

为什么要考虑交通枢纽？为什么要建立换乘车站？

将SO₂通入下列溶液中一定有沉淀生成的是    (    )

A．氯水

B．NaOH溶液

C．BaCl₂溶液

D．Ba(NO₃)₂溶液

国际互联网作为广告媒体得到迅猛发展，目前已经可以完全替代其它传统媒体的作用。

咽部黏膜层慢性充血、黏膜下结缔组织及淋巴组织增生，黏液腺肥大（）

A.急性咽炎

B.急性喉炎

C.慢性单纯性咽炎

D.慢性肥厚性咽炎

E.萎缩或干燥性咽炎

An overly centralized economy, not the changes in the climate, is responsible for the poor agricultural production in Country X since its new government came to power. Neighboring Country Y has experienced the same climatic conditions, but while agricultural production has been falling in Country X, it has been rising in Country Y.
Which of the following, if true, would most weaken the argument above

A．Industrial production also is declining in Country X.

B．Whereas Country Y is landlocked, Country X has a major seaport.

C．Both Country X and Country Y have been experiencing drought conditions.

D．The crops that have always been grown in Country X are different from those that have always been grown in Country Y.

E．(E) Country X’s new government instituted a centralized economy with the intention of ensuring an equitable distribution of goods.