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

未分类题What scientists Johan Feenstra and Rob Hayes did was that______.A．they made an electronic newspaperB．they created a piece of videoscreen-like paperC．they made a tiny piece of primitive e-paperD．they invented the electrowetting technology

未分类题It can be inferred from Paragraph 3 that______.A．alcohol can lower the risk of plaque in arteriesB．some components of wine is bad for healthC．chocolate is good for healthD．alcohol can be used as medicine

未分类题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.

未分类题The phrase 'zero in'(Line 5, Paragraph 4)most probably means______.A．take aimB．return to zeroC．pass throughD．get involved

未分类题The first sentence in Paragraph 1 is used by American school children because______.A．it represents typical American cultureB．it represents nine planets in the solar systemC．it is often used in teaching astronomyD．it is a good example of mnemonics