By "alcohol is a dietary Jekyll and Hyde"(Line 1,Paragraph 4), the author means______.
A. drinking alcohol can be of both advantage and disadvantage
B. alcohol is necessary for daily diet
C. Jekyll and Hyde is a brand of alcohol
D. drinking alcohol can also be very dangerous
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decide whether the following translations are true or false. as for gaps in the fossil
decide whether the following translations are true or false. colleges flood the postal systems with news of who has won a place in next fall’s freshman class. 译文： 美国的邮政部门将被雪片般的大学录取通知书所淹没。()
下列哪种溶液的浓度与C(H2SO4)0.1mol/L的浓度相等？()
A. C(1/2H2SO4)0.2mol/L溶液
B. C(1/2H2SO4)0.1mol/L溶液
C(1/2H2SO4)0.05mol/L溶液
D. C(1/2H2SO4)0.5mol/L溶液
Which of the following is TRUE of the targeted cancer therapy？
A. It has been booming since its first occurrence fifty years ago.
B. Its new development relies on the expansion of treatment target.
C. It has prevented tumors to metastasize or spread through the body.
D. It is a vaccine-like therapy by training the patient"s immune systems.
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