肉眼能看点的恒星约有（）颗。
A、1万
B、6千
C、3千
D、10万
参考答案：B
________ in his book, he didn't notice me ________ I entered the room.
A．Devoted; when
B．Absorbed; while
C．Absorbed; when
D．Devoted; while
内关（Nèiguān，PC6）手厥阴心包经；络穴；八脉交会穴（通于阴维脉）
