What is the main idea of the news item？
A. The space shuttle would be under close inspection.
B. One of the crew members failed to head home.
C. Unexpected weather delayed the landing of Endeavor.
D. The space shuttle made a smooth landing.
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According to the author，the tallest girl among the children
A. danced with a serious expression．
B. Was a dark and rounded girl．
C. acted as a hovering dragonfly．
D. pursued her love in the dance
Which of the following details of St．Petersburg is INCORRECT？
A. It is a city with a grand history．
B. The personal crime rate is increasing．
C. Few heritages ale left from the past：
D. It gets the opportunity to change．
默多克(Murdock.D．D)的迁移率计算公式表述为()。
A. 迁移率(%)=（实验组成绩一控制组成绩）÷（实验组成绩十控制组成绩）×100
B. 迁移率(%)=（实验组成绩一控制组成绩）÷控制组成绩×100
C. 迁移率(%)=（实验组成绩一控制组成绩）÷实验组成绩×100
D. 迁移率(%)=（控制组成绩一实验组成绩）÷（实验组成绩十控制组成绩）×100
To ensure the future of mankind, it is crucial to
A. explore our planet’s abundant resources
B. adopt an optimistic view of the world
C. draw on our experience from the past
D. curb our ambition to reshape history
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