Space is a dangerous place, not only because of meteors(流星) but also because of rays from the sun and other stars.The atmosphere again acts __1__ our protective blanket on __2__ .Light gets through, and this is essential __3__ plants to make the food which we __4__ .Heat, ...
【其他】Space is a dangerous place, not only because of meteors (流星) but also because of rays frSpace is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light ...
Space is a dangerous place, notonly because of meteors (流星)but also because of rays from the sun and other stars. The atmosphereagain acts __1__our protective blanket on __2__.Light gets through, and this is essential __3__plants to make the food which we __4__.Heat, __5__...
B __ __ __ Space is a dangerous place,not only because of meteors(流星)but also because of rays from the sun and other stars.The atmosphere(大气层)again acts as our protective blanket on earth.Light gets through,and this is essential for plants to make the food which we eat.Heat,too...
【题目】Space is a dangerous place, not only because of meteors(流星) but also because of rays from the sun and other stars. T he atmosphereagain acts__1_our protective blanket on _2_.Light gets through, and this is essential 3plants to make the food which we_4. Heat,_5_, makes ...
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts (67) our protective blanket on (68) . Light gets through, and this is essen- tial (69) plants to make the food which we (70) . Heat,...
1【题目】Space is a dangerous place, not onlybecause of meteors but also because of rays from the sun and other stars . T he atmosphere again acts (1)__our protective blanket onearth . Light gets through , and this is essential for plants(2) __ (make) the foodwhich we eat . Heat...
【题目】Space is a dangerous place, not only because of meteors(流星)but also because of rays from the sun and other stars. T he atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, ...
Space is a dangerous place, not only because of meteors (流星) but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is necessary for plants to make the food that we eat. Heat, too, makes our...
__” dose of radiation that we receive each year is about two millirems;it __(17)__ according to where you live,and this is a very rough estimate.Scientists have reason to think _(18)__ a man can _(19)__ more radiation without being damaged;the figure of 60 rems has been __(...