问题
选择题
下列各组微粒按半径递增顺序排列，且两微粒电子数相同的是（ ）
A．K+-Ca2+
B．S2--Cl-
C．Na+-F-
D．Al3+-S2-
答案
答案：C
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下列各组微粒按半径递增顺序排列，且两微粒电子数相同的是（ ）
A．K+-Ca2+
B．S2--Cl-
C．Na+-F-
D．Al3+-S2-
答案：C
Passage Four
When is a driver likely to have a sleep-related accident according to researchers
A．In the middle of the morning is 10 times as likely as those driving in the evening.
B．Very early in the evening is as likely as those driving early in the morning.
C．Very early in the morning is much more likely than those driving early in the evening.
D．In the middle of the evening is 10 times as likely as .those driving early in the morning.