什么是夯实机械，夯实机械的特点及应用范围有哪些？

乳牙患龋达到高峰的年龄是（）。

A.3～4岁

B.5～6岁

C.7～8岁

D.9～10岁

E.11～12岁

Part 4

Questions 26-45

·Read the following text and decide which answer bestfits each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.

How to Tell Which Side You Favor

Brain researcher Ned Herrmann tested more than 7,000 people to find out which side of the brain they favored. He found a p relationship between hemisphere (26) and the way subjects made a (27) : left-brain-oriented subjects were more often lawyers, writers, bookkeepers, doctors, tax experts, etc. —jobs (28) with logical, language-related information. Those who favored the right hemisphere (29) out to be poets, politicians, musicians, architects, entrepreneurs, dancers and (30) —top executives. Herrmann’s studies showed that the most successful people in any (31) are those who use both the left and right brains.
One test for hemisphere dominance is to (32) how you turn your head and eyes when (33) questions asked by someone in front of you. Research suggests that if you generally turn to the left, you have a right-brain (34) ; if you turn to the right, (35) are you prefer work that (36) use of logic or language.
Another test for dominance involves directions for (37) a product. A left-hemisphere- oriented person usually follows instructions in a step-by-step (38) —from written sentence to written sentence. Someone with p right-side input will probably (39) the written directions and assemble the pieces by (40) the diagram or picture.
If you think you’re right-brained, (41) this teaser. Read the sentence below carefully and count the number of f’s:
FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC
STUDY COMBINED WITH THE EXPERIENCE OF MANY YEARS.
Did you find all six fs If not, don’t be surprised. Only 15 percent of those who take this test (42) .If you counted less than six—most count three—you probably (43) the f in each "of". Since "of" is pronounced "ov", the verbal left hemisphere took the verbal (44) and overrode the right, "seeing" hemisphere; (45) forcing the wrong conclusion.

A．studying

B．looking

C．getting

D．taking

小明这样描述自己的家乡：气候湿热，风光秀美，独特的傣家文化，是全国著名的旅游区。那么小明的家乡可能在

A．湖南张家界

B．四川峨眉山

C．湖北神龙架

D．云南西双版纳

公共管理活动的合法性基础为( )。

A．公共性和私人利益

B．效率性和私人利益

C．公共性和公共利益

D．效率性和公共利益

2009年1月20日中午12时许，美国当选总统奥巴马宣誓就任美国第44任总统，他在美国最高法院首席大法官罗伯茨的见证下庄严宣誓。誓词大意为：“我郑重宣誓，我将忠实履行美国总统职责，尽己所能保存、保护和捍卫美国宪法……”下列关于美国总统的职责与美国宪法内容的叙述，符合历史事实的是（）

A.根据三权分立的原则，总统无权否决国会通过的法律

B.最高行 * * 属于由选民直接选举产生之总统

C.美国联邦宪法是世界上第一部资产阶级成文宪法，其解释权在最高法院

D.按照宪法规定，美国政府各部门按“分权与制衡”的原则成立