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【单选题】
若有int x=50;，则下列语句( ) 会输出“50%”。A.
printf("%d%%",x);
B.
printf("%%d",x);
C.
printf("%d%",x);
D.
printf("%d%%");
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【简答题】From Washington, this is news. I'm Dave DeForest reporting. U.S. President Barack Obama meets with Cuba‘s president: Mr. Obama and Cuban President Raul Castro held a __1__ news conference after “f...
【单选题】在下列反应中，钠元素被氧化的是 [ ] ①NaH+H 2 O=NaOH+H 2 ↑ ②2Na+O 2 Na 2 O 2 ③2NaCl 2Na+Cl 2 ↑ ④2Na 2 O+O 2 2Na 2 O 2 ⑤NaNO 2 +6Na=4Na 2 O+N 2 ↑ ⑥2Na+Na 2 O 2 =2Na 2 O
A.
①②③
B.
②③⑤
C.
③④⑤
D.
②⑤⑥
【单选题】下列氧化还原反应中，1molH 2 O得到1mol电子的是
A.
Cl 2 +H 2 O='HCl+HClO'
B.
2Na 2 O 2 +2H 2 O=4NaOH+O 2 ↑
C.
2Na+2H 2 O=2NaOH+H 2 ↑
D.
3NO 2 +H 2 O=2HNO 3 +NO
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A.
199kPa
B.
14kPa
C.
101kPa
D.
87kPa
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【简答题】根据短文内容判断下列句子的正(T)、误(F)． This is Barack Obama．He is the president(总统)of the United States．His wife(妻子)is Michecle Obama．They have two daughters．Malia Obama is eleven years old．Sasha Obama is eight year...
【单选题】Which U.S. president expanded the Everglades National Park?
A.
Donald Trump
B.
Barack Hussein Obama
C.
George H.W. Bush
【单选题】Unit 3-10 Rather than heed President Barack Obama's appeal for gragmatism, the Congess is losing its value as a problem-solver and becoming more unworkable.
A.
obey
B.
catch
C.
hear
D.
observe
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A.
正确
B.
错误
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