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【单选题】
$("div#intro .head") 选择器选取哪些元素?A.
id="intro" 或 class="head" 的所有 div 元素
B.
class="intro" 的任何 div 元素中的首个 id="head" 的元素
C.
id="intro" 的首个 div 元素中的 class="head" 的所有元素
D.
class="head" 的所有 div 元素
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反馈参考答案：
举一反三
【单选题】有白、黄、粉3种颜色的3个宠物小屋。小花猫咪咪钻进了其中一个小屋。小兰问咪咪究竟在哪儿。奶奶说:“咪咪在白色小屋里。”爸爸说:“咪咪不在黄色小屋里。”妈妈说:“咪咪不在白色小屋里。” 如果3个人说的话只有一句话是真的,请问咪咪究竟在哪个屋子里?
A.
咪咪在白色小屋里
B.
咪咪在粉色小屋里
C.
咪咪在黄色小屋里
D.
咪咪不在黄色小屋里
【多选题】not... until, get everything ready, he, for the experiment, leave, the lab, Xiao Wang
A.
It was not until he got everything ready for the experiment that Xiao Wang left the lab.
B.
It was not until he got everything ready for the experiment which Xiao Wang left the lab.
C.
It was not until he got everything ready for the experiment when Xiao Wang left the lab.
D.
It was Xiao Wang who did not leave the lab until he got everything ready for the experiment.
【单选题】听力原文：W: Can we leave the lab now, teacher? M: No, you must tidy the lab before you leave. When can the student leave?
A.
The student can't leave unless he has put everything back in the cupboard.
B.
The student can leave after he turns off the electricity.
C.
The student can leave after he has tidied the lab.
【单选题】Before you leave the lab, the doors and windows ____shut in case of rain.
A.
is
B.
are
C.
is to be
D.
are to be
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