问题
单项选择题
关于化学试剂的购买下列说法不正确的是（）。
A.尽量避免使用高毒性、高危险性的危险试剂，必须采购时尽量少购少贮
B.经济条件允许的条件下可购买级别较高的试剂，准确度高
C.易氧化及变质的试剂尽量少买
D.标准物质可根据用量购买，避免浪费
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
关于化学试剂的购买下列说法不正确的是（）。
A.尽量避免使用高毒性、高危险性的危险试剂，必须采购时尽量少购少贮
B.经济条件允许的条件下可购买级别较高的试剂，准确度高
C.易氧化及变质的试剂尽量少买
D.标准物质可根据用量购买，避免浪费
参考答案：B
| 完形填空。 | ||||
| It must have been after two o'clock in the morning when the last guest left. Though we had enjoyed their stay, my wife and I were very thankful to close the door on them. We 1 all the dirty dishes and glasses as they were, and after opening several windows to let some 2 air in and the smell of food out, we climb in bed and 3 asleep. I couldn't have been asleep for more than half an hour when I awoke with a strong smell of smoke. 4 half asleep, I stepped into the living-room, and there, through heavy clouds of smoke, I saw one of my curtains was on fire. I should have 5 the windows first, 6 instead I tried to beat about the fire with a folded newspaper. When this failed, I hurried into the kitchen to 7 a bucket of the water. At the same time I shout to Barbara, who 8 called the fire brigade (消防员) before coming to helped me . We have to work at top speed carrying buckets of the water. From the kitchen to 9 the fire, fanned by the wind from the windows, spreading. We were unable to 10 out the fire. Luckily, the fireman arrived in no time, and they had little difficulty in putting out the fire. | ||||
|