题目

How to have fun in Chicago without spending a lot of money? Sightseeing ★The Art Institute of Chicago has a fine collection of photos and paintings. The ticket is $10.00. But on Tuesdays you’ll get in free. ★The Sears Tower is the world’s third tallest building. By going to the 103rd floor, you can get a great view of the whole city! All for only $8.50. Free show ★There are free concerts in Grant Park in summer. They are held from Wednesday to Saturday at 7:00 pm. ★Attend the taping of a TV show for free. The Oprah Winfrey Show and the Jenny Jones Show both offer tourists f设NA为阿伏加德罗常数的值，下列说法中正确的是A. 由6 g CaCO3和5 g KHCO3组成的混合物中含有的碳原子数为0.11NAB. 42 g C3H6中含有的共用电子对数目为8NAC. 1 L0.01 mol L-1 KAl(SO4)2溶液中含有的阳离子数为0.02NAD. 标准状况下，22.4 L氯气与56 g铁充分反应，转移的电子数为3NA