After some time the second stage of the space shuttle, having used up its fuel, just like the booster, separates and ______.

The earthquake happened in south Xinjiang on Feb. 24. T...

单项选择题The earthquake happened in south Xinjiang on Feb. 24. This ______ killed 266 people.

Stressful environment leads to unhealthy behaviors such...

单项选择题Stressful environment leads to unhealthy behaviors such as Ix)or eating habits, which ______ increase the risk of high blood pressure and heart disease.