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【单选题】
密度知识与生活联系非常紧密,下列关于密度的一些说法正确的是A.
1 kg冰与1 kg水的密度相等
B.
乒乓球不慎被挤瘪但无破损，球内气体密度变大
C.
为减轻质量，比赛用自行车采用强度高、密度大的材料制造
D.
冬季湖面结冰，湖水按温度不同分层排列，4 ℃时水密度最小，位于最上层
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【单选题】字符数组进行初始化,( )形式是错误。
A.
char c1[ ]={'1', '2', '3'};
B.
char c2[ ]=123;
C.
char c3[ ]={ '1', '2', '3', '\0'};
D.
char c4[ ]="123";
【单选题】Some experts have said that ________ children believe they can succeed, they will never become totally confident of themselves.
A.
if
B.
since
C.
once
D.
unless
【简答题】Now that the experts have agreed to give us some help, ____________ (我们有信心克服困难).
【单选题】听力原文： American scientists have found that some birds are more intelligent than experts had originally believed. The scientists say birds have abilities that involve communication and different kinds o...
A.
Talking.
B.
Communication and memory.
C.
Singing.
D.
Finding the way.
【单选题】Experts have long been interested in the education reforms in some top universities.
A.
Y
B.
N
C.
NG
【简答题】As for the medication of some severe symptoms, some experts doubt about the rush and have questioned ______
【单选题】以下对字符数组进行初始化，形式错误的是
A.
char c1[ ]={'1','2','3'};
B.
char c2[ ]=123;
C.
char c3[ ]={ '1','2','3','\0'};
D.
char c4[ ]="123";
【单选题】According to some experts in fitness those who have no disease are healthy.
A.
Y
B.
N
C.
NG
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