【单选题】Why is tai chi popular with old people?
A.
It helps to keep cool.
C.
It helps to benefit their health.
【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
【判断题】Old speakers are more sensitive to the social significance of the style. of their speech, showing their stronger intention to converge to or diverge from the listener.()
【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