B)Four. C)Six. D) Twelve.-|||-20.A)The ability to cope well with long term mental and emotional problems.-|||-B)The ability to collect the needed information from the space.-|||-C)The ability to make maps of the planets being studied.-|||-D)The ability to adapt well to the living structure in the space.-|||-21.A)It takes 20 minutes for a radio signal to travel from Mars to Earth.-|||-B)It is a method of training the crew members`patience.-|||-C)It takes 20 minutes to prepare for communication-|||-D)It is essential for making sure the content of communications is clear.-|||-22.A)The one in Hawii includes women research subjects.-|||-B)The one in Hawii is conducted in a special structure.-|||-C)The one in Hawii lasts for nearly three years.-|||-D)The one in Hawii provides an environment most like Mars.

[单选题]( ) —_______．—He is six．A． How old are youB． How old is sheC． How old is heD． How old is it

[单选题]20．A． withB．aboutC．forD．in

[单选题]20．A． seeB．askC．findD．tell

[主观题]B．Leo is sixty-six． But he looks young． He has two children-one is a son and the other is a daughter． He has lo tennis rackets，8 baseballs，6 basketballs， 12 soccer balls and 8 volleyballs． But he never plays sports． He only likes collecting sports th

[单选题]A．On Sundays，Peter gets up at six． He puts on(穿) his clothes and does some wash-ingc洗衣服）． He eats breakfast at seven o'clock． He doesn't go to school: There are not any classes on Sundays． He reads English and Chinese and does his homework in the m

[单选题]A． stand B cope C approve D retain

B)Nobel Prize for Economics.-|||-C)Nobel Prize for literature. D)Nobel Prize for

[单选题]A． abilityB． capabilityC． capacityD． faculty

In the last four years,four in seven.-|||-bigcirc D.In the last seven years,one

[单选题]LTE的缩写是( )A．Long Term EvolutionB．Long Time EvolutionC．Long Time EquipD．Last Term Evolution