【C20】A．optimisticB．idealisticC．realisticD．dynamic

The tone of the passage can best be described as ______.A．analytical and optimisticB．biase

【C17】A．optimistiCB．pathetiCC．simplistiCD．realistic

What does the word "altruism" in Paragraph Two mean？A．The quality of being optimisticB．The

The tone of the author about Japans economy is______.A．cautiously optimisticB．quite undeci

【C20】A．shakingB．noddingC．shookD．/

下列物质中 ( )是目前已经肯定的必需脂肪酸。A C16:2B C18:2C C18:3D C20:3(E)C20:4