雷雨时，如果你是见到闪电后3秒才听到雷声，则打雷的地点距离你大约是：A．500米B．900米C．1公里D．2公

Which of the following can be directly obtained by means of an indicator card？

A.power

B.maximum pressure in a cylinder

C.mean pressure in a cylinder

D.all of the above

A．apo AI

B．apo B100

C．apo C II

D．apo E

A．802.11a

B．802.11b

C．802.11g

D．802.11n

A、Proteins

B、DNA and not RNA

C、RNA and not DNA

D、Either DNA or RNA

Which of the following is TRUE？

A．Sometimes we can not see a thing because we look directly at it.

B．Sometimes we can not see a thing because we use the sides of eyes to see it.

C．The center of the eye is more sensitive than the sides of the eye after dark.

D．The center of the eye is as sensitive as the sides of the eye in daylight.

Which of the following statements is supported by the text？

A．Humans can display pure emotion.

B．Anger is always accompanied by either anxiety or fear.

C．Cultural differences can be easily overcome.

D．Some emotions can be distinguished cross-culturally.

A．Chemical disinfectants.

B．Bacteria.

C．Fungi.

D．Pentachlorophenol.

Which of the following best describes the hypothesis of Hoyle and Wickramashinghe？

A．Molecules of interstellar formaldehyde can evolve into complex organic molecules.

B．Interstellar formaldehyde can be synthesized by tunneling.

C．Cosmic rays can directly synthesize complex organic molecules.

D．The galactic clouds are the places where prebiological evolution of compounds necessary to life occurred.

Which of the following directly causes the chest pain or tightness？

A．blocking of the coronary artery

B．narrowing of the artery

C．high blood cholesterol

D．stress

Which of the following statements is true？

A．Solar energy can be used for heating, washing, cooking and lighting.

B．Solar energy can only be used in a passive role now.

C．Solar energy can be fed directly into the national electricity grid.

D．Solar energy can become America's greatest property one day.