[单项选择]Which of the following statements is true. The benefit of the open cover system is that ______.
A. it avoids to negotiate insurance terms
B. it avoids tire necessity of issuing a separate policy for each individual shipment
C. it provides insurance cover to all kinds of goods
D. it avoids the necessity of issuing an insurance certificate

[单项选择]If p and q are statements, which of the following formulas is tautological ( )
A. ┐ (p→∧q
B. (p∨→p∧q
C. (q∧(p→)→p
D. ((p→∧→q

[单项选择]Which of following statements about testing software with data is (are) true 　　Ⅰ. The primary purpose of such testing is to find errors. 　　Ⅱ. Such testing can demonstrate the existence of errors but can not demonstrate the absence of errors.
A. Neither
B. Ⅰ only
C. Ⅱ only
D. Ⅰ and Ⅱ

[单项选择]Which of the following statements about computers is true according to the passage
A. Computers can beat any chess player in the world.
B. Computers can never be used to forecast weather.
C. Computers can be trained to understand some words spoken by a speaker.
D. Computers can be made to think as a teenager does.

[单项选择]Which of the following statements about electronic ink is true
A. (A) The electronic book is now available for $ 200,400.
B. (B) The ink has already been produced a great deal.
C. (C) The ink will work only with something conductive.
D. (D) The ink will make an electronic book unaffordable.

[单项选择]Which of the following statements concerning Adorno's musical criticism can be inferred from the passage

[单项选择]Which of the following statements concerning nanotechnology research is most directly suggested in the passage
A. (A) Nanotechnology research tends to be more focused on the process of building multiple molecules than chemistry research.
B. (B) Nanotechnology research is increasingly less bound to operations on the microscopic level than it once was.
C. (C) The practitioners of nanotechnology tend to be more optimistic than pragmatic in choosing its methodology.
D. (D) Nanotechnology research involves a much greater level of technical knowledge, on the whole, than chemistry research.
E. (E) Nanotechnology research tends to be more concerned at this stage with precision than convenient mass production.

[单项选择]Which of the following statements is TRUE

[单项选择]Which of the following statements about manufacturing before 1870 can be inferred from the passage______

[单项选择]Which of the following statements is true