单选题 Astronomers have learned that the spectacular tails of comets are extremely tenuous bodies, ______ particles that the pressure of light can bend them.
【正确答案】 B
【答案解析】such…that如此…以至于；be composed of由…组成。句意：天文学家表明彗星壮丽的尾部由极度纤细的物体构成，物体颗粒如此微小以至于光波都能把它们压弯。