单项选择题

Which of the following is mentioned as an improvement on the launch of Discovery

A．a special examination of the O ring
B．greater safety design of the crew cabin
C．redesign of the booster system
D．careful consideration of the effects of weather

<上一题目录下一题>

热门试题

单项选择题

Children from disrupted families are less likely to ______.

A．be thrown into prison
B．commit suicide
C．get divorced latex in their lives
D．be on intimate terms with people

单项选择题

The article probably appeals to ______.

A．anyone who regards the debate over family structure as an attack on single mothers and their children
B．anyone who believes in evidence of social-science
C．people who ignore the issue of changing family structure
D．people who respect women's right to pursue freedom and independence in children-bearing and children-rearing