Ababymightshowfearofanunfamiliaradult,_______heislikelytosmileandreachouttoanotherinfant.

TheTVstation,in________tomassivepopulardemand,decidedtocontinuethesoapopera(肥皂剧).

计算二重积分dDxy，其中区域D为曲线r1cos0与极轴围成.

求曲线y=x^2与直线y=0，x=1所围成的平面图形绕x轴旋转一周所得旋转体的体积V.

Somemoleculesarelargeenough________(see)undertheelectronicmicroscope.