雷达在军事上称为“千里眼”,其模仿的是 [ ]
A.鹰的眼睛
B.乌龟的背甲
C.蝙蝠的回声定位
D.萤火虫的发光
答案:C
My grandma _____ for half a year. [ ]
A. has been dead
B. was dead
C. has died
D. died
Some students get _____ when they find watching English movies _____.[ ]
A. frustrated; frustrating
B. frustrating; frustrating
C. frustrated; frustrated
D. frustrating; frustrated