更多"If only my husband (be)______here w"的相关试题:
[填空题]If only my husband (be)______here with me!
[单项选择]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 earth. Light gets through, and this is (68) for plants to make the food (69) we eat. Heat, too, makes our environment endurable. Various kinds of rays (70) through the air from outer space, (71) enormous quantities of radiation from the sun are (72) off. As soon as men leave the atmosphere they are (73) to this radiation but their spacesuits or the walls of their spacecraft, (74) they are inside, do prevent a lot of radiation damage.
Radiation is the greatest known (75) to explorers in space. The unit of radiation is called "rein (雷姆)". Scientists (76) reason to think that a man can put up with far more radiation (77) 0.1 rem without being damaged; the figure of 60 rems has been agreed on. The trouble is that it i