如图所示是课本中的四个实验，关于其对应的实验结论，下列说法中正确的是（ ） ①
题型：选择题
问题：
如图所示是课本中的四个实验，关于其对应的实验结论，下列说法中正确的是（ ）
①甲图说明大气压强的存在 ②乙图说明重力势能可以转化为机械能
③丙图说明通电导体在磁场受到力的作用 ④丁图说明超声波的存在
A．①③
B．②④
C．①②
D．只有③正确
题型：选择题
根据下列句子所给首字母和汉语意思，在空白处写上完整的单词，每空一个词。
小题1:You can easily c______ the problems if you study British history.
小题2:England is the largest of the four countries and for c______ it is d
ivided into three zones.
小题3:The c__________ of these stamps took ten years.
小题4:Your composition is very good except for some spelling e__________.
小题5:It is Mary rather you who is to b_________for the accident.
小题6: His speech made a strong ____________（印象）on the audience.
小题7:Some people like to lie on the beach, but I prefer __________(观光).
小题8:Urban inhabitants have to live with the _________(典型的) noises of cities.
小题9:We were ______(激动的) when we saw the high mountains and beautiful scenery.
小题10:The boss is _________（谨慎的） about making decisions.