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单项选择题
在区域较大的高山滑雪板滑雪时，应注意什么事项？
A.早去早回，不擅自越界
B.到雪场深处探险
C.单独出发，不告诉他人行踪
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问答题
From the passage we know that Symbion Inc. _____.
From the passage we know that Symbion Inc. _____.
A、has been banned by the government from producing artificial hearts
B、 will review the effects of artificial hearts before designing new models
C、may continue to work on new models of reliable artificial hearts
D、can make new models of artificial hearts available on the market in 10 to 20 years
答案：
may continue to work on new models of reliable artificial he...
