【单选题】Why is tai chi popular with old people?
A.
It helps to keep cool.
C.
It helps to benefit their health.
【单选题】Don’t wear these old clothes. They are ____ style.
【简答题】The crazy song Gangam Style is really turning into ________ global phenomenon, which gives some old people ________ surprise.
【判断题】烤月饼时需用约 160 °C左右的炉温烤制。
【单选题】化学与生产、生活密切相关,下列叙述正确的是
B.
葡萄糖注射液不能产生丁达尔效应现象,不属于胶体
D.
从海水中可以得到NaCl,电解饱和NaCl溶液可以得到金属Na
【单选题】化学与生产、生活密切相关。下列叙述正确的是
B.
BaSO 4 在医学上用做钡餐,Ba 2 + 对人体无毒
C.
14 C可用于文物的年代鉴定, 14 C与 12 C互为同位素
D.
常温下铁与浓硫酸中不能反应,故通常用铁罐盛装浓硫酸