题目

阅读理解 According to a recent study, a new genetically modified ricecan prevent infections of HIV, the virus responsible for the disease AIDS. The study reports the newly-developed rice produces proteinsthat attach directly to the HIV virus. This process prevents the virus from mixingwith human cells. The scientists say it can remove the effect of the virus and blockits spreading. The Joint United Nations Program on HIV/AIDS reports thatworldwide, nearly 37 million people were living with HIV in 2017. The organizationsays the largest number of those are in developing countries. Nearly two下列车辆中行驶时噪声最小是（　　）A．拖拉机B．大卡车C．公交车D．小轿车．