My friend, Tom, left New York in 1976 and since then. A．hadn’t been heard of B．hasn’t been heard of C．hasn’t heard of D．ha
I have bought a good book, ______ that will surely interest ______ of the students． A．one; everyone B．the one; everyone C．one; ever
Becoming aware of our mother's age, not just in numbers of years but _____ her psychological and physical state, often helps us to understand her better. A. in spite of B. on account of C. i
古诗词的古人为我们留下的宝贵精神财富。下列诗句中只涉及物理变化的是（ ） A．野火烧不尽，春风吹又生 B．春蚕到死丝方尽，蜡炬成灰
7．下列划线字意义和用法全都相同的一项是 A．臣之壮也，犹不如人 / 丹不忍以己之私，而伤长者之意 B．夜缒而出 / 偏袒扼腕而进 C．吾其还也，亦去
二次函数y=ax2+bx+c的部分对应值如下表： x-3-2-101234y60-4-6-6-406求不等式ax2+bx+c＞0的解集.
一定量由CO2、H2O（气）、CO的混合气体通入一盛有足量Na2O2的密闭容器中，并不断用电火花引燃，充分反应，最后密闭容器中___________气体（填“有”或
