许多科学实验证明，____是主要的遗传物质．
我国人数最多的民族是
选择正确的词义。
金碧辉煌____ ①闪耀的光彩 ② 照耀
神清气爽____ ①明朗 ②干脆 ③舒服
“十一”假日，爸爸驾车带小辉全家外出旅游，如果汽车以72km/h合____ m/s的速度匀速行驶了2h，则汽车行驶了____ km。
It was a difficult time for the relatives of Missing MH370 passengers when they heard the bad news, but they didn't ________ hope.
