有关可乐定的叙述，错误的是A．可乐定是中枢性降压药 B．可乐定可用于治疗中度高血压

两个电阻的阻值分别为R₁=6Ω，R₂=3Ω，串联起来接入电路，那么通过它们的电流之比I₁：I₂=______，加在他们两端的电压之比U₁：U₂=______．

当空腹血糖低于多少为低血糖症（）

A.1.8mmol／L

B.4.2mmol／L

C.3.9mmol／L

D.2.2mmol／L

E.2.8mmol／L

下列选项与小儿肥胖症无关的是（）

A.营养摄入过多

B.活动过多

C.父母肥胖

D.疾病

E.精神创伤

列车制动后单独缓解机车，当松开单阀的手柄时，手柄自动恢复到制动区最小减压位。

In English the spelling of words does not always represent the sound. So people say /rait/ but spell it right or write, or even rite. Combinations of letters may be pronounced in many ways. And some words just seem to have too many letters.

　 For Americans things are a little bit easier, thanks to the work of Noah Webster, a teacher who graduated from Yale University in 1778. As a young man, he had fought against the British in the American War of Independence, and he felt that written English in the newly independent United States should have a distinctive American look.

　 So he began his work on American English. His first book, The Elementary Spelling Book, suggested simplifying the spelling of English words. The book was extremely popular. By the 1850s, it was selling one million copies a year, making it one of the most popular school books ever.

　 Many of the suggestions were quickly adopted. Center instead of centre, program instead of programme, and flavor instead of flavour. Others, however, such as removing silent letters like s in island or the final e in examine, were not .

Webster is best known for his American Dictionary of the English language, which first appeared in 1828. It introduced lots of new American words, with information about their pronunciation and use, and, of course, the new spelling. The British criticized the dictionary, but it quickly became a standard reference book in the States. Today, Webster's dictionary is still the number one dictionary for American students.　　

小题1:What is the text mainly about?

A．Webster and his best sellers.

B．British and American English.

C．The history of American English.

D．The man who made spelling simple.小题2:Which is the right order according to the text?

①Webster graduated from Yale University.

②American Dictionary of the English language came out.

③Webster's book was selling one million copies a year.

④Webster took part in the American War of Independence.

A．②①③④

B．③①②④

C．④①③②

D．①②③④小题3:What can we learn from the text?

A. All the spelling of words does not represent the sound.

B. The Elementary Spelling Book was published in the 1850s.

C. Webster's suggestions were accepted completely.

小题4:What attitude do the British have towards Webster's dictionary?

A．They thought highly of it.

B．They found fault with it.

C．They argued bitterly about it.

D．They followed the examples of it.